7.3 Power Stroke Tachometer Not Working- [Cause and Fix]

7.3 power stroke tachometer not working is a common problem that raises the alarm to the car users since you cannot monitor the readings and performance of your vehicle. A tachometer is a device in the vehicle that helps display the speed of the engine rotation crankshaft so that you can easily know the speed your car is moving at.

Therefore, when the tachometer is not working, you cannot monitor the engine’s speed with your car, and you are at risk when driving it. Many issues can cause problems with your tachometer, and you can fix the issue immediately to avoid damaging the whole system since the issues can be with the wiring and some faulty parts within.

The article below shows why the power stroke is not working and how to solve them together with the questions below:  What causes the rpm tachometer not to work on the 7.3l diesel engine f250 1993? How do you test a tachometer sensor? Is it bad to let a 7.3 idle? Where is the ICP sensor on a 7.3 Diesel? After that are the frequently asked questions and the conclusion at last.

What causes the rpm tachometer not to work on 7.3l diesel engine f250 1993

IssueFunctionEssential product
Inaccurate readingsReadings show the performance of the car 
Failure of the tachometer to respondIt shows that the display is bad or the tachometer itself needs replacement.Check Amazon for the best tachometer
Busted screenIt shows the screen is not working and that you need to replace itCheck Amazon for the best-LED screen

A tachometer is a device in the car found on the dashboard next to the speedometer. The tachometer helps measure the revolutions per minute, which is the RPM. Tachometers are different from digital and analog ones but can work in both manual and automatic vehicles.

A tachometer has different parts, including the dial that has numbers ranging from one to seven in most vehicles. There are the indicator points in the numbers that show the location of the RPM when driving. The yellow color shows that you are starting to move to any danger zone, while the red zone is purely a danger zone you need to avoid.

There are some common issues that you can experience with your tachometer that show it is not working, which are as follows:

Failure of the tachometer to respond

Failure of the tachometer to respond

After turning on the engine and the tachometer is not responding, consider checking the wiring issues or the system itself if it is faulty. Choose to use a voltmeter to check the wiring issues by setting the engine idle for a while and check for any problems. If the recorded readings are normal, the case can be with the tachometer that is busted, and you need to replace it.

All the issues with the tachometer failing to respond are easy to diagnose and fix. In some cases, when the tachometer display fails to respond, you can find it easy to set, but it is good to consult a technician to help you solve the problem easily since they are sure of what they are fixing.

Busted LED screen

Most vehicles with tachometers are using the digital display so that they cannot display the readings when the LED screens are faulty or broken. The LED screen can display some information about what is happening, and you will be able to check and fix them immediately. Consider replacing the LED screen if it is faulty as soon as you identify the issue to inspect the vehicle’s performance and use some parts that can only work with the corporation of the LED display.

Inaccurate readings

In most cases, when you get that the tachometer is providing inaccurate readings, consider checking the wiring applications that can cause the issue. There could be electrical interference from other parts that are causing the issue. Check on the tachometer gauge since it can cause the same problem with your device readings. Consider repairing the installation of the wires to get accurate readings.

When the tachometer is not working, there could be possible issues with the tachometer that you need to identify and fix them. Below are some of the reasons:

  • A blown fuse is a common problem that you need to check the fuses to ensure they are working properly.
  • Bad wiring such that during the installation of the cables, there was a mistake somewhere that can cause the tachometer not to work. You need to check the readings, and if they are wrong, consider checking issues with wiring and fix them.
  • Poor coinciding of the calibration with the motor causes the RPM readings to be different from the motors’ reading. In this case, consider consulting professionals since you can damage the whole system.
  • Failure of lights to work on the tachometer when the tachometer is not working the lights will go off or they may not display correctly.
  • A faulty tachometer is old and needs replacements. In this case, you need to try fixing all the possible issues, and if they fail to work, the problem is with the tachometer, and you need to buy a new tachometer for the vehicle.

How do you test a tachometer sensor?

How do you test a tachometer sensor

 i. Set the meter to an AC voltage that you need to have a voltmeter

 ii. Connect the negative and positive meters to the respective areas

 iii. Start the vehicle and give it time to idle.

Is it bad to let a 7.3 idle?

Letting the 7.3 diesel engine for long is not good since it will glaze the cylinder walls causing them to be blow-by and have low compression. Therefore, you should not allow the engine to be idle for so long since there are effects, but you can leave it for some time when resting.  

Where is the ICP sensor on a 7.3 Diesel?

ICP is an abbreviation of injector control pressure from the injector pump or fuel rail at the lower side of the 7.3 around the HPOP.

Frequently asked questions

Can one replace the injector control pressure?

To replace the injector control pressure, you need to locate its position in the vehicle and remove the pressure from the fuel system before removing the sensor and fixing a new injector control pressure.


7.3 power stroke tachometer is a common problem you can expect with your car. There are many reasons why the tachometer fails to work and how you can identify the device is not working properly. The article above provides why the tachometer is not working and some information related to it.

Therefore after identifying the problems, consider finding ways to fix them by replacing faulty parts and repairing some parts. If you have an idea about the tachometer, contact a professional to help you select the problem since when you try fixing it you can damage the whole system. 

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