Speedometer Head: Description and Operation

With the ignition switch in the ON or START position, power is supplied:
^ through 10 A fuse (No. (25) located in the fuse block)
^ to combination meter terminal (43) for the water temperature gauge
^ combination meter terminal (22) for the tachometer and
^ combination meter terminal (2) for the fuel gauge and speedometer.
Ground is supplied:
^ to combination meter terminal (38)
^ through body grounds (M51), (M76) and (M77)

SPEEDOMETER
The vehicle speed sensor provides a voltage signal to the combination meter for the speedometer.
The voltage is supplied:
^ to combination meter terminals (3) and (19) for the speedometer
^ from terminals (1) and (2) of the vehicle speed sensor.
The speedometer converts the voltage into the vehicle speed displayed.