on my 78 the gas guage doesnt seem to register anything in the tank. I checked underneath and from the tank runs an orange, and a black wires up to the front then inside the cab. I took the dash apart, removed the instrument panel, and everything seems to be hooked up correctly. I get 2-4 V constantly through the orange wire. I did notice when I start it up the gauge goes up slightly, but not even past the E mark. Anyone have an ideas here on the problem?