The tachometer in a car works by measuring the rotating speed of the engine, which is proportional to the revolutions per minute (RPM) of the engine. The most common cause of a tachometer that stops working is a problem with the RPM sensor. This sensor is usually located on the transmission or engine block and sends a signal to the tachometer about the RPM of the engine. If the sensor is faulty or damaged, the tachometer will not receive the correct signal and will stop working.
2. Problem with the Tachometer Itself
If the RPM sensor is working properly, the problem may be with the tachometer itself. The tachometer is an electrical instrument, so it is possible for it to malfunction or become damaged. If this is the case, the tachometer will need to be repaired or replaced.
3. Electrical Problem
Another possibility is that there is an electrical problem that is causing the tachometer to stop working. This could be a loose connection, a faulty wire, or a problem with the fuse or relay that powers the tachometer.
4. Problems with the Engine
In rare cases, a tachometer that stops working may be a sign of a problem with the engine. This is because the RPM sensor is connected to the engine, and a problem with the engine could cause the sensor to malfunction. If you are experiencing other symptoms in addition to the tachometer not working, such as engine misfires or stalling, it is important to have the engine checked out by a mechanic.
Here are some specific things you can check if your tachometer stops working:
- Check the RPM sensor for damage or corrosion.
- Check the electrical connections to the RPM sensor and the tachometer.
- Check the fuse or relay that powers the tachometer.
- If you have a digital tachometer, check the battery.
If you are not comfortable performing these checks yourself, you can take your car to a mechanic to have them diagnosed.
