How do you fix the engine temperature gauge on a 96 Geo Tracker?

To fix the engine temperature gauge on a 1996 Geo Tracker, first check the fuse related to the gauge, as a blown fuse can cause it to malfunction. If the fuse is fine, inspect the wiring and connections leading to the gauge for any damage or corrosion. Additionally, test the engine coolant temperature sensor with a multimeter to ensure it's functioning correctly; replace it if necessary. If the gauge still doesn't work after these checks, the gauge itself may need to be replaced.