Gas gauge
There should be a 4 inch long strip of metal that clips one end to the fuel line as it exits the gas tank and the other end clips to the fuel line on the other side of the short piece of rubber fuel line. This is the ground for the fuel gauge float since the rubber gasket on the fuel gauge float to fuel tank isolates the float from ground. Make sure the clips are clean and the fuel lines it clips to are clean with wire wool and spray with battery post protector fluid.
Terry