1. Check the tachometer cable.
The tachometer cable is a thin, flexible cable that connects the tachometer to the engine. If the cable is broken or disconnected, the tachometer will not work. To check the cable, look for any visible damage or fraying. If you see any damage, replace the cable.
2. Check the tachometer sender.
The tachometer sender is a small, round sensor that is located on the engine. The sender sends an electrical signal to the tachometer, which then displays the engine's RPM. If the sender is faulty, the tachometer will not work. To check the sender, disconnect the electrical connector from the sender. Then, use a multimeter to measure the resistance between the two terminals on the sender. The resistance should be between 100 and 200 ohms. If the resistance is not within this range, replace the sender.
3. Check the tachometer itself.
If the cable and sender are both working properly, the problem may be with the tachometer itself. To check the tachometer, disconnect the electrical connector from the tachometer. Then, use a multimeter to measure the voltage between the two terminals on the tachometer. The voltage should be between 12 and 14 volts. If the voltage is not within this range, replace the tachometer.
4. Check the fuse.
If the tachometer, cable, and sender are all working properly, the problem may be with the fuse. The tachometer fuse is located in the fuse box under the hood. To check the fuse, remove the fuse from the fuse box and inspect it for any damage. If the fuse is blown, replace it with a new fuse of the same amperage.
5. Check the wiring.
If the fuse is not blown, the problem may be with the wiring. To check the wiring, use a multimeter to trace the wiring from the tachometer to the sender and from the sender to the fuse box. If there is any damage to the wiring, repair it or replace the wiring.
