Tachometer: Description and Operation

With the ignition switch in the ON or START position, power is supplied:
^ through 10 A fuse (No. (12), located in the fuse block [J/B])
^ to combination meter terminal (41) for the water temperature gauge,
^ to combination meter terminal (22) for the tachometer and speedometer
^ to combination meter terminal (10) for the fuel gauge.
Ground is supplied:
^ to combination meter terminal (28)
^ through body grounds (M43), (M44) and (M60).

The tachometer indicates engine speed in revolutions per minute (rpm).
The tachometer is regulated by a signal:
^ from terminal (3) of the ECM
^ to combination meter terminal (29) for the tachometer.