Meters and Gauges

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).
The water temperature gauge indicates the engine coolant temperature. The reading on the gauge is based on the resistance of the the thermal transmitter.
As the temperature of the coolant increases, the resistance of the thermal transmitter decreases. A variable ground is supplied to terminal (37) of the combination meter for the water temperature gauge. The needle on the gauge moves from "C", to "H".
The tachometer indicates engine speed in revolutions per minute (rpm).
The tachometer is regulated by a signal
^ from terminal (3) of the Electronic Concentrated Control System (ECCS) control module (ECM)
^ to combination meter terminal (35) for the tachometer.
The fuel gauge indicates the approximate fuel level in the fuel tank.
The fuel gauge is regulated by a variable ground signal supplied
^ to combination meter terminal (4) for the fuel gauge
^ from terminal (1) of the fuel tank gauge unit
^ through terminal (3) of the fuel tank gauge unit and
^ through body grounds (B6) and (B14).
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.