How do you fix broken gas gauge on 89 Ford Aerostar?

To fix a broken gas gauge on a 1989 Ford Aerostar, first check the fuse related to the fuel gauge to ensure it's not blown. Next, inspect the wiring and connections at the fuel tank and the gauge itself for any damage or corrosion. If those components are fine, the issue may be with the fuel sending unit located in the tank, which might need replacement. Always ensure to disconnect the battery before working on electrical components for safety.