HouseCallAuto 10/28/2011Ground the wire at the sending unit for the gauge and see if gauge makes a sweep to the opposite side. if no movement then the fuel gauge is no good or there is an open circuit leading to the gauge. I cannot tell you the wire color because my listings of wiring diagrams do not go back to 78 or even 80.
Hershel Corley 3/27/2012Bill, Try this site! GOOD info