How do you fix fuel gauge on 1988 Cadillac brougham?

To fix the fuel gauge on a 1988 Cadillac Brougham, first check the fuse related to the fuel gauge in the fuse box. If the fuse is intact, inspect the fuel sending unit located in the fuel tank, as it may be faulty or have a bad connection. Additionally, ensure that the wiring harness to the gauge is secure and free of corrosion. If these steps do not resolve the issue, consider replacing the fuel gauge itself.