Tachometer: Description and Operation

Battery voltage is supplied to the gauges from fuse 10 when the ignition switch is in ON or START. The details are as follows:

Tachometer
The tachometer displays engine speed in rpm. Voltage pulses are taken from the ignition system and sent to the tachometer. The tachometer responds to the frequency of the voltage pulses, which vary according to engine speed. The ECM processes these pulses into a signal that causes the gauge needle to move