From VIN S5220000

Battery voltage is supplied to the gauges from the METER fuse in the passenger compartment fuse box when the ignition switch is in ON or START.

Fuel gauge
The fuel gauge pointer is controlled by magnetic coils inside the instrument cluster. The circuit is grounded through the fuel gauge sender inside the fuel tank unit. The sender acts as a variable resistor. When fuel in the tank is full, resistance is low, and the pointer indicates full. When the tank is low, resistance is high, and the pointer indicates empty.

Fuel gauge sender
A float attached to a variable resistor is mounted in the fuel tank. With a full tank, the float arm sits at the top of the tank and the variable resistance value is high. As the float drops, so does the resistance value. The sender operates the engine coolant temperature gauge.

Engine coolant temperature gauge
The coolant temperature gauge pointer is moved by the magnetic field of two coils at right angles to each other. Battery voltage is applied to the "C" coil from the METER fuse. The circuit then divides into two. One path continues through the H coil and then to ground. The other path goes through the variable resistance engine coolant temperature sender and then to ground. When the coolant temperature is high, the resistance of the engine coolant temperature sender is low and less current flows through the "H" coil, pushing the pointer toward "H". When the coolant temperature is low, the resistance of the engine coolant temperature sender is high and more current flows through the "H" coil pushing the pointer toward "C". With two coils operating the pointer, the gauge is not affected by changes in the voltage.

Engine coolant temperature sender
The engine coolant temperature sender is a thermistor, in which resistance decreases as engine coolant temperature increases.

Tachometer
The tachometer is controlled by a solid state circuit. With the engine running, ignition coil pulses proportional to engine speed are read into the solid state circuits, which output the engine speed in RPM's through the tachometer.

Speedometer
The speedometer is controlled by a solid state circuit. As the wheels are turned, an electrical signal is sent from the vehicle speed sensor to the speedometer assembly. The speedometer registers the speed of the vehicle in miles per hour.