Fuel Gauge
WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
The instrument cluster receives the fuel signal via hard-wired circuitry from the fuel pump module. The fuel pump module changes resistance according to the amount of fuel in the fuel tank and varies the current flow through the fuel gauge. A low resistance will result in a lower gauge indication, while a high resistance will result in a higher gauge indication. The fuel gauge is controlled by the instrument cluster microprocessor and varies the position according to data received from the fuel pump module.