i have a 1977 mustang and the fuel gauge isnt working in it, either is the amps, what could be the problem? i was thinking maybe the hole gauge panel needs replaced just because its old and i know some of the wires for the lights are dryrotted and breaking. but i also know there is some rust in the gas tank. could that have ruined the sensor inside the tank for it? any ideas of what could have broke it? and ways or fixing it?