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The pointer in fuel gauge is moved by the magnetic field of 2 coils. The coils are at right angles to each other. Battery voltage is applied to the empty coil and the circuit is divided at the opposite end of the coil. One path continues to ground through the full coil, while other path goes to ground through the fuel gauge sending unit (a variable resistor) in fuel tank.

When fuel level in tank is low, the fuel gauge sending unit resistance is low. A large flow of current passes through the empty coil and the fuel gauge sending unit resistor. This moves fuel gauge pointer to toward the "E" (empty) position.

When fuel level in tank is high, the fuel gauge sending unit resistance is high. More current now flows through the full coil, moving the fuel gauge pointer toward the "F" (full) position. With 2 coils operating pointer, the fuel gauge is not affected by changes in battery voltage.