How do you fix geo prism fuel gauge?

To fix the fuel gauge in a Geo Prism, first check the fuse related to the fuel gauge system, as a blown fuse can cause the gauge to malfunction. If the fuse is intact, inspect the wiring and connections at the fuel tank sender unit for any damage or corrosion. If everything appears intact, the issue may lie with the fuel sender unit itself, which may need to be replaced. Finally, after repairs, recalibrate the gauge if necessary to ensure accurate readings.