The Truth About Mechanical, Electrical, and Stepper-Motor Gauges (2022)

Long before muscle cars were even built, automakers needed a wayfor drivers to monitor engine functions in their daily transportation. Gauges were developed from simple-operating devices like an Ammeter gauge to make sure the battery had juice and a fuel gauge so you didn’t get stuck along-side the road.

As cars became more technically endowed, more gauges were added to the dash. It didn’t take long until dash clusters with voltage, fuel levels, oil pressure, water temperature, speed, and tachometers were facing drivers. Way back in 1957, Vern Westberg realized that automobiles could use a more accurate monitoring system, and AutoMeter was founded.

The Truth About Mechanical, Electrical, and Stepper-Motor Gauges (1)

Whether you’re building a custom dash or just adding a few gauges under your existing dash, you have choices.

When you hop behind the wheel of your hot rod, other than the power of your engine, what is something that you really notice? Hopefully, you said the gauges. You do watch your gauges so your engine doesn’t melt-down, right? When you are either in the process of building or updating your ride, you have to decide what gauges will best work for your application. Not only do you want to consider cost, looks, and size, but whether to install electric or mechanical-style gauges. We all have at least one buddy that swears he will only use mechanical gauges – because they have to be more accurate. We wondered if that were actually true. That was one of the questions we posed to Joseph Mills of AutoMeter, so we could get some honest information that enthusiasts should consider when deciding to chooseaftermarketgauges.

The Truth About Mechanical, Electrical, and Stepper-Motor Gauges (2)

Mechanical pressure gauges – like this oil pressure gauge – use a tube that fills with the fluid being monitored. A huge down-side is if the tube breaks inside your car, you have mess to clean up.

Electrical, Mechanical, Or Something Called Stepper Motor?

For years, if you were contemplating aftermarket gauges, your only two choices were either electrical or mechanical. Both offer a good design, but there is still that old connotation that mechanical gauges are more reliable and more accurate than electrical. Once and for all, that simply isn’t true. To add some confusion to the available choices, there is a (relatively speaking) new kid on the block: the Stepper-Motor gauge. These high-tech instruments are controlled by a microprocessor on a circuit board, not a capillary tube or magnets like mechanical or electrical gauges. But, if all three gauges are considered equal, how do you know which you should use?

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“A lot of it comes down to personal preference. We still sell a lot of mechanical gauges, though I greatly prefer using an electronic for something driven on the street. A lot of old-school guys came up in a time when mechanical gauges were significantly better than electronic ones. That hasn’t been true for a long time. I prefer the ease of installation an electronic gauge affords you.” Joseph continued, “I’m also not huge on running fluids into the passenger compartment. For a more extreme build or something with a lot of engine, I’d definitely move toward the digital Stepper-Motor gauges. While theycost a bit more money, it’s cheap insurance. Especially when you start to add up what it cost to put your engine together.”

The Truth About Mechanical, Electrical, and Stepper-Motor Gauges (3)

Mechanical temperature gauges rely on a capillary tube with a bulbous end that connects to the engine.

Electrical Gauges

An electronic gauge functions by use of a small magnetic core wrapped with copper that will move in relationship to the voltage it receives. This voltage is regulated by the sending unit, which will change its resistance-to-ground, based on the pressure it is receiving. As the temperature or pressure changes, the resistance varies, moving the indicator to a calibrated position on the dial. These gauges are physically different from mechanical and Stepper-Motor gauges, and use a short sweep reading.

I prefer the ease of installation an electronic gauge affords you. – Joseph Mills, AutoMeter

“A typical AutoMeter electronic gauge is going to be no worse than +/- 5-percent accurate at full deflection. This is less than the width of the pointer, so given the dial resolution, any variance is almost academic,” Joseph stated.

Pros:Inexpensive, easy to install, great real-world accuracy, very durable.

Cons:Not as accurate as a Stepper-Motor gauge, limited pointer sweep.

(Video) Mechanical vs Electrical gauges


These gauges have a direct connection (via a tube or capillary) to the engine. Take for instance an oil pressure gauge. It has a plastic or copper oil tube from the back of the gauge that connects to the engine. A temperature gauge will use a long capillary tube – similar to an old-style glass thermometer – that is mounted into the engine. The bulbous protrusion on the end of this tube is heated by the engine fluid, and an ether gas encapsulated within the tube expands, pushing the meter movement forward and displaying the temperature.

An advantage to mechanical gauges is they can be utilized without being connected to the car’s electrical system. This is great for a race car, as when the car is shut off in the pits, the gauge will still display the current temperature. Some feel that electric gauges are better, because the fluid-filled lines of a mechanical gauge can rupture. Remember, this line, hose, or whatever you want to call it, is running inside your car.

“An AutoMeter mechanical gauge will be a little more accurate, not really exceeding +/- 2-percent at full deflection. The increased sweep, and therefore, dial resolution, also aids in visibility,” Joseph remarked.

Pros:Great accuracy, full dial-sweep, always on, has a direct, physical connection to engine.

Cons:Can be harder to install, introduces fluid in the passenger compartment.

Digital Stepper-Motor

The next type of instrument we’ll touch onis fairly new to the automotive world: Digital Stepper-Motor gauges. These highly advanced gauges provide the highest possible levels of accuracy, precision, response, and durability. “The digital Stepper-Motor electronic gauges are the most accurate, with a typical variance of +/- 0.5-percent. These are also the most durable gauges and use the same solid-state sending units as our high-end data systems, which are a big upgrade from standard senders,” Joseph stated.

The Truth About Mechanical, Electrical, and Stepper-Motor Gauges (4)

(Video) Autometer Electrical vs Autometer Mechanical Gauges

The Stepper-Motor gauge is the latest evolution in gauge design. It utilizesmicroprocessorsfor operation.

Stepper-Motor gauges are controlled by a microprocessor that utilize laboratory-grade sending units for the ultimate in accuracy. An added bonus to choosing a Stepper-Motor gauge is that any of the sending units can also be used to provide data streams to a data logger or standalone engine management system. Mechanical and electronic gaugescan cause concern for some enthusiasts when the gauge needle doesn’t return to zero. This is not an issue, just a fact of operation and supplied voltage. With a Stepper-Motor gauge, every time the gauge is powered, it will zero calibrate. This ensures that over the gauge’s lifetime, it will always remain as accurate as it was the day it was built. These gauges utilize 270 degrees of the dial, making them very easy to read.

Since the Stepper-Motor gauge is, well, a circuit board, we asked about failure rates. “Anything is possible, but it’s highly unlikely. I suppose if our gauges never broke, we wouldn’t have a warranty, but our across-the-board failure rates are in tenths of a percentage, and the Stepper-Motor gauges are even more robust. I wouldn’t expect any issues with one of those over the life of the vehicle,” Joseph stated confidently.

Pros:Best possible accuracy, durability, and easiest to install. Available with advanced features like warnings, recall, and electronic-device control.

Cons:A bit more expensive.

Is an Electric, Mechanical, or Stepper-Motor Gauge Easier To Install

There is little difference in the work involved to install any of the gauges, as it will likely take you about the same amount of time for each. However, routing of the mechanical gauge’s tubing will require a bit more planning. That’s because you will need to be careful so you do not kink or damage the line as you route it from the engine to the gauge. You will also want to make sure that the line is as short as possible to get the most accurate reading. With an electronic or Stepper-Motor gauge, as long as you get the wire connected, the gauge will work fine.

High Speed Pursuits

When it comes to speedometers, once again, you have a decision to make.While the tried-and-true cable-driven speedometer does still have a place in the hobby,an electronic mph-meter simply requires you to connect a couple of wires between the gauge and either a Vehicle Speed Sensor (VSS) in the transmission, or a GPS-signal receiver.

The Truth About Mechanical, Electrical, and Stepper-Motor Gauges (5)

An electronic speedometer will deliver better accuracy, and is more versatile in regard to installation.

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Again, your application and budget will determine which is your best choice. For instance, if your car was originally equipped with a cable-driven speedometer, it would probably be cost effective to replace it with another. But keep in mind, your new, cable-driven speedometer could fluctuate and be inaccurate. This is not any fault of the new gauge, but rather, because there is a flexible shaft encased in a plastic housing that extends between the transmission and the speedometer. As it ages, this flexible shaft can bind and stick inside the housing, which causes the fluctuation. Have you ever seen a speedometer bounce from20 to 100 mph while you drive? If you are planning a new installationusing a cable-driven gauge, the flexibility of the cable assembly will limit how it can be routed.

The Truth About Mechanical, Electrical, and Stepper-Motor Gauges (6)

The small GPS-receiver to the right of the control module can be mounted almost anywhere on the car. It is then connected to the control module, which is then connected to the speedometer.

If you feel the need toupdate you ride with an electric speedometer while still using a cable-driven system, you can use a Speed Sensor, but the ease of installing an electronic speedometer really makes that option obsolete.

The advent of commercially available GPS signals has impacted gauge design immensely. Now, instead of having a cable running from your transmission to the gauge, or needing a VSS of some sort connected to your transmission, you can simply mount a GPS receiver –almost anywhere on your car – and then connect a couple small wires to the gauge. When it comes to choosing a speedometer, you have a multitude of options.

The Truth About Mechanical, Electrical, and Stepper-Motor Gauges (7)

If using a GPS-enabled speedometer, the receiver needs to be mounted in an area where it can receive the satellite signal. That means possibly having the receiver mounted out in the open.

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It seems that deciding what gauges will best suit your application is a matter of personal taste. All three of the discussed gauges offer an accuracy that is nearly imperceptible to the human eye, and durability that has an almost equal playing field. The final decision mostly comes down to what you are comfortable using, and how much the final cost will affect your budget.

If you still have questions about gauges, and would like more information, you can check out the AutoMeter website, and/or give them a call at (866) 248-6356.


Are mechanical or electrical gauges better? ›

Is an Electric Gauge More Reliable than a Mechanical Gauge? A properly installed gauge should be reliable no matter what type of gauge it is. However if there's a failure, mechanical gauges can cause much more damage than electric gauges.

What 3 gauges are most important? ›

The three gauges you'll need are: Boost Gauge. Oil Pressure Gauge. Wideband Air/Fuel Ratio Gauge.

Are electronic oil pressure gauges accurate? ›

“A typical AutoMeter electronic gauge is going to be no worse than +/- 5-percent accurate at full deflection.

What is the most important gauge? ›

The most important instrument in the car is the oil pressure gauge. The instrument of choice for most racecars is a mechanical gauge. There are a number of different mechanical gauges on the market, but one consideration is the overall range of the gauge.

How do mechanical gauges work? ›

Mechanical pressure gauges are connected directly to the process fluid being measured (i.e. oil). As the process fluid pressure changes the pressure on the bourdon tube also changes which in turn moves the pointer on the gauge. Mechanical temperature gauges also utilize a bourdon tube.

Are mechanical oil pressure gauges good? ›

Mechanical gauges tend to be extremely reliable and accurate, often used in race car applications.

What is the most used gauge while driving? ›

The minimum number of gauges on a passenger car dashboard are the speedometer and the fuel gauge. The most common additional gauge is the temperature gauge followed by the tachometer, voltmeter and oil pressure gauge.

Why do people have Boost gauges? ›

A boost gauge is used to ensure excessive pressure is not being generated when boost pressure is being modified to levels higher than OEM standard on a production turbocharged car.

What is a boost gauge used for? ›

A boost gauge is a pressure gauge that indicates manifold air pressure or turbocharger / supercharger boost pressure in an internal combustion engine.

How do electric gauges work? ›

Gauges (Part 2) - Introduction to Electric Gauges - YouTube

Which is more accurate analog or digital tire gauge? ›

Calibration - A calibrated digital pressure gauge stays calibrated much more reliably than a pressure gauge with analog output. Digital calibration is done using software, so it's much more precise.

How does an electric oil pressure gauge work? ›

The oil pressure gauge works as a monitor, and its job is to see the oil pressure in the main oilways near the filter and the pump. The engine block has a tapping and either an oil pipe or a sensor screwed into it. The oil warning light has a sensor and is screwed into the T-piece or the union.

What is a gauge in a car? ›

The gauges in a car are diagnostic tools that the car uses to display information about its various systems. The gauges are typically displayed on the dashboard of your car behind the steering wheel. The gauges in a car help catch fluctuations or issues before they cause serious damage.

What is oil temperature gauge? ›

Oil temperature gauges are used for monitoring oil temperature. Oil subjected to too high of heat can lose it's lubrication properties that keep metal parts from touching. The needle will indicate the current oil temperature on the application being monitored.

What gauges do race cars have? ›

5 Essential Gauges For Your Race Car
  • Oil Temperature. Most race cars come equipped with oil temperature gauges, but if yours doesn't, it's time to get one installed as soon as possible. ...
  • Oil Pressure. ...
  • Battery Voltage. ...
  • Fuel Pressure. ...
  • Boost Gauge.
20 May 2022

How many types of mechanical gauges are there? ›

Mechanical gauges are tools which are used for measuring dimensions, pressure levels. These devices come in two variants: mechanical and electromechanical.

What is the type of mechanical gauge? ›

Mechanical gauges are instruments that measure pressure, dimensions, levels, etc. They can be mechanical or electro-mechanical devices and offer displays ranging from direct-reading rules to digital LCDs. Gauges which measure pressure are classified as analog or digital depending on their readouts.

What are the two types of gauges? ›

There are basically classified into two types, Rib type snap gauges. Plate snap gauges.

How do you test an electric oil pressure gauge? ›

  1. Check the Gauge with 0 Ohm Signal (Ground) Connect the signal from the gauge to the gauge ground wire. ...
  2. Confirm the Gauge is OK by Using a Known Good Signal. ...
  3. Confirm the Type of Sending Unit You Have. ...
  4. Verify Wiring and Common Ground. ...
  5. Verify Ohm Signal from Sending Unit. ...
  6. Verify Ohm Signal at the Gauge.

What is good oil pressure? ›

The ideal oil pressure varies depending on the car brand and model, but generally, the ideal oil pressure is between 25-65 PSI.

Why does my oil pressure go up when I accelerate? ›

Hi There, This is completely normal for the oil pressure to increase when accelerating. The oil pressure inside the motor increases as the motor works harder. Your oil pressure switch reads this change in pressure and relays this to the oil pressure gauge.

What is the speed gauge on car called? ›

speedometer, instrument that indicates the speed of a vehicle, usually combined with a device known as an odometer that records the distance traveled.

How many gauges are in a car? ›

These measuring devices are essential for proper functioning of automobiles. There are mainly four types of gauges namely the fuel gauge, speedometer, temperature gauge and the tachometer.

What is the RPM gauge called? ›

A tachometer is an instrument that measures the working speed of an engine, typically in revolutions per minute (RPM). It is commonly used in cars, boats, planes, and other vehicles. Most tachometer gauges have either an analog (dial) or digital (LCD or LED screen) display.

What does vacuum mean on a boost gauge? ›

Boost typically is only going to happen when the throttle opening is at or near full throttle, with heavy load, and can become more with higher RPM. Vacuum becomes zero, and pressure occurs, which is the result of the supercharger packing air/fuel into the cylinders. How is this helpful?

Is a vacuum gauge the same as a boost gauge? ›

Boost/Vacuum Gauges are designed to be used on any gasoline-powered engine equipped with a Turbo or Supercharger. Whereas Boost Only Gauges are mainly designed for diesel-powered vehicles as they do not produce vacuum and normally run boost pressures much higher than your standard gasoline application.

How do you test a boost gauge? ›

Connect the boost gauge hose to the gauge, and using a bicycle pump add some air to the tube slowly. The gauge should rise. Many Boost Gauges only go to 20 or 30 PSI, so be careful on how much air you push into the gauge. In other words – go slow on the bike pump.

What is negative boost? ›

When the engine is running, it's sucking air from the intake manifold, causing a negative pressure. The difference is that under a load demand, the turbo can push more air into the manifold causing the pressure to cross over 0 to be a positive number, which is "under boost".

What is the boost pressure? ›

Definition of boost pressure

: the pressure in the induction system of an aircraft engine in excess of the standard sea-level atmospheric pressure.

What is boost pressure sensor? ›

The boost pressure sensor with temperature sensor is installed in the air inlet pipe ("inlet manifold") between the turbocharger and engine, and measures the absolute pressure. Additional consideration for the intake air temperature allows more accurate measurement of the intake air mass.

What is electrical pressure gauge? ›

Digital pressure gauges measure the pressure within a system in a special manner. They convert the pressure to an electronic signal. The gauge shows the pressure using a digital display, furthermore the signal can be used to control equipment. Digital gauges in comparison with analog ones have a higher accuracy.

How do analog pressure gauges work? ›

How does a pressure gauge work? | Bourdon tube vs. diaphragm element

How do temperature gauges work? ›

The tip of the sensor has a spring that is attached to a rod, leading up to the gauge needle. The spring sits inside the stems sensing end. When heat is applied to the sensing coil, movement in the coil is created which causes the needle in the gauge to move – thus displaying the temperature.

Who makes the most accurate digital tire pressure gauge? ›

4. Most Accurate: TireTek Premium Tire Pressure Gauge. Quality construction and simple operation make the TireTek gauge a solid choice. Of all the gauges we tested, only TireTek lists the grade of ANSI B40.

What type of tire gauge is most accurate? ›

Intercomp Intercomp Tire Pressure Gauge 360045

This one is the cream of the crop, with a quick digital gauge and a claimed accuracy within 0.1 percent.

How do I know if my pressure gauge is accurate? ›

You can check the air pressure in a tire with the gauge in question and then check the same tire with another quality tire pressure gauge. When there is a significant difference in the readings (3 or more psi) between the two gauges, one or both gauges might be inaccurate.

What causes oil pressure gauge to not work? ›

The oil pressure gauge will usually drop when a few things could be happening. Either the motor is in fact low on oil, the oil pump could be failing or the oil pressure sending unit is not working properly and may be producing a faulty reading.

What causes oil pressure gauge to max out? ›

One of the most common causes of high oil pressure is a blocked, damaged, or clogged oil filter. While this typically only happens when your oil filter is particularly old, but it can happen if something comes up and hits your oil filter while driving.

Where should your oil gauge read? ›

The needle on the pressure gauge should settle at the midpoint after the car has been running for about 20 minutes. If it settles toward the top of the gauge, it could be indicating high oil pressure. The pressure relief valve could be stuck or faulty, or there could be a blockage in the oil delivery lines.

How do you read an RPM gauge? ›

The tachometer indicates how many times the engine is rotating each minute. Multiply the number on the gauge by one thousand. For example, if the needle is sitting at 1, the engine is rotating one thousand times per minute.

Why is my car at 1 RPM in park? ›

The newly lean (too much air relative to fuel) status will result in the engine's computer pumping in additional fuel, resulting in an abnormally high idle. A malfunctioning throttle system can cause both a high idle as well as an engine stall. A dirty air intake or cracked air intake tube is often the culprit.

What are the three most important gauges and indicator lights? ›

Which three gauges or indicators are the most important to be aware of? Coolant temperature gauge, oil pressure gauge, and battery voltage gauge. How often is it advised to have maintenance done on your vehicle? At least twice a year.

What's engine oil pressure? ›

Normal engine oil pressure is between 25 and 65 PSI. While the ideal oil pressure can change depending on the make and model of your car, the general rule is that oil pressure should be above 25 and below 65 PSI (pounds per square inch).

What engine oil temp is too high? ›

A quality conventional motor oil will tolerate oil sump temperatures of up to 250 degrees, but starts breaking down over 275 degrees. The traditional approach is to try to hold oil temperatures between 230 and 260 degrees.

What is H and C in car? ›

Meaning of C and H in a car

This shows that the engine is running well at an ideal temperature. However, if the needle is at either the “C” (cold) or “H” (hot) points of the temperature gauge, there are likely engine problems. A reading at the “C” point shows that the engine is too cold and needs to be heated up.

What fuel do NASCAR cars use? ›

Sunoco's 260 GTX Racing Gasoline is the official fuel of NASCAR. Sunoco 260 GTX is an unleaded racing fuel that contains no oxygenates and no metal additives (lead). It also does not contain any ethers or alcohols such as ethanol or methanol or any other oxygenates.

Is there a fuel gauge on a NASCAR? ›

That is, they don't have one thing most of us a take for granted, a fuel gauge to indicate to the drivers how much gas they have left. The simple explanation is that, like other information-gathering devices, they are not allowed in the car by NASCAR.

Why is there no speedometer in NASCAR? ›

Being fast on a race track often has more to do with feeling how much grip your car has than actually knowing what speed you're traveling, which is why stock cars don't have speedometers. However, that can make adhering to the pit lane speed limit a bit tricky.

What is a mechanical temperature gauge? ›

A mechanical temperature gauge operates with a bourden tube in the engine which causes the fluid to rise as the temperature increases. From the bourdon tube sender, oil is pumped to the gauge. In the gauge there is a long, sealed capillary tube that contains an ether gas that expands when the probe tip is heated.

What are mechanical gauges in cars? ›

The data is useful for determining split times and many other things. Essentially there are two types of gauge; mechanical and electrical. Mechanical gauges have a capillary tube or hydraulic line running into them and require no electrical connection other than for illumination.

What is a mechanical oil pressure gauge? ›

Mechanical Oil Pressure Gauges

Instead of measuring resistance with electrical currents, mechanical gauges funnel oil into small pipes at the same pressure it flows in the engine. If anything punctures the oil pipe, it could start spewing oil at engine pressure!

How do electrical gauges work? ›

Electric gauges, on the other hand, work by using the sensor screwed into the engine block to produce a variable resistance that affects the amount of current passing through the circuit containing the gauge and sensor.

How do you test mechanical temperature gauge? ›

Testing a mechanical temperature gauge is a pretty easy job, provided you've got the gauge out of the vehicle already. You simply set the gauge's temperature probe in a pot filled with water on your stove, then set the gauge and the rest of the capillary tube away from the heat.

How does a temperature gauge work? ›

The measuring system itself is filled with a liquid. If the temperature changes, the internal pressure of the temperature gauge with probe will change as well. The pressure is transferred via a tube to a pointer shaft and thus the temperature value is indicated on the scale.

How do you use a multimeter to check a temperature gauge? ›

Submerge your temperature sensor in the hot water and wait a few seconds to let your multimeter take a reading. Write down your reading so you can easily reference it. A hot water reading should give you around . 25 volts.

What is a stepper gauge? ›

Stepper motor based gauges are a great way to control a pointer gauge. They are small in size, low power and can respond with a smooth but quick movement. The hundreds of steps allow them to be very accurate as well.

What is a stepper motor fuel pressure gauge? ›

AutoMeter's Digital Stepper Motor Fuel Pressure Gauge will precisely measure your exact fuel pressure at levels of accuracy previously unheard of even in professional gauges.

How do electric oil pressure gauges work? ›

The oil pressure gauge works as a monitor, and its job is to see the oil pressure in the main oilways near the filter and the pump. The engine block has a tapping and either an oil pipe or a sensor screwed into it. The oil warning light has a sensor and is screwed into the T-piece or the union.

How do you test an electric oil pressure gauge? ›

  1. Check the Gauge with 0 Ohm Signal (Ground) Connect the signal from the gauge to the gauge ground wire. ...
  2. Confirm the Gauge is OK by Using a Known Good Signal. ...
  3. Confirm the Type of Sending Unit You Have. ...
  4. Verify Wiring and Common Ground. ...
  5. Verify Ohm Signal from Sending Unit. ...
  6. Verify Ohm Signal at the Gauge.

What is good oil pressure? ›

The ideal oil pressure varies depending on the car brand and model, but generally, the ideal oil pressure is between 25-65 PSI.

Why is oil pressure gauge high? ›

The most common cause of high oil pressure is engine temperature, which is ultimately what dictates the temperature that the oil reaches. Malfunctioning engine components can also cause oil pressure to rise.

How is gauge determined? ›

Gauge is determined from the weight of a solid sphere of lead that will fit the bore of the firearm and is expressed as the multiplicative inverse of the sphere's weight as a fraction of a pound, e.g., a one-twelfth pound lead ball fits a 12-gauge bore.

How is gauge wire measured? ›

Stranded wire gauges should be measured by calculating the equivalent cross sectional copper area. First, measure the bare diameter of a single strand and locate the circular mils value in the row that matches your measurement. Second, multiply the circular mils by the number of strands in the cable.

Why is wire measured in gauge? ›

Gauges are old measures of thickness. They originated in the British iron wire industry at a time when there was no universal unit of thickness. The sizes of the gauge numbers were the result of the process of wire-drawing and the nature of iron as a substance.


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