Fuel Gage

The pointer of the Fuel Gage is moved by the magnetic fields of two coils. The coils are at right angles to each other. Battery voltage is applied to the "E" coil, and the circuit divides at the opposite end of this coil. One path continues to ground through the "F" coil. Another goes to ground through the variable resistor of the Fuel Tank Unit.

When the tank is low, the resistance of the Fuel Tank Unit is low. A large current flows through the "E" coil and the Fuel Tank Unit resistor. This pulls the pointer towards on the scale. When the tank is full, the Fuel Tank Unit resistance is high. More current now flows through the "F" coil, moving the pointer to "F" on the scale.

With two coils operating the pointer, the Fuel Gage is not affected by changes in the voltage of the system.