A tachometer can be repaired by troubleshooting the issues with the related components, then replacing fuses and wires or recalibrating the tachometer as needed. There are a variety of mechanical and technical issues related to tachometer problems that can be easily fixed by checking these components.
To address issues, troubleshoot and repair a tachometer:
- Address safety and instructions
- Check fuses and wires
- Calibrate the tachometer
- Replace the tachometer
When troubleshooting or repairing a vehicle, turn the engine off, work in a well-ventilated area and wear protective eye wear. Before troubleshooting the tachometer, be familiar with this section in the car's owner's manual. The manual can offer insights to issues and further instruction and repair guidelines for the car's specific model.
Find the vehicle's fuse box and check that the tachometer's fuse is not blown. If the fuse has a black color or the metal strip is broken, replace the fuse. Referring to the car's manual, find the wire diagram for the tachometer. If the display is not working or it is working erratically, a melted or damaged wire may need replacement. Compare the tachometer wiring to the wiring diagram in the owner's manual and replace any damaged wires or reconnect any loose wires.
If the tachometer's readings are inaccurate and the calibration is not in sync, the system may need to be reset. Refer to the owner's manual to get specific instructions on how to reset the gauge. Reset the car's engine control unit by locating the ECU fuse and removing it. Turn on the car without starting the engine and wait five minutes. Replace the ECU fuse and wait for the check engine light to come on then turn off the engine.
If issues are not addressed by checking the fuse and wiring or resetting the calibration and engine control unit, the tachometer may need to be replaced.