Gold Lifetime Member
Join Date: Dec 1999
Location: Yorkville, Illinois USA
it's either a wiring problem (broken insulation, wire shorting to ground.)between the guage and the sender, or a bad sender. To check it, locate and disconnect the wire at/near the sending unit. In a 1st gen, this connector is at the rear center of the trunk, not sure about yours. With it disconnected, the guage should go to past full and stay there. If it doesn't, the wire or guage is bad, grounding out forward of where you disconnected it. Next, ground the wire to the body with a jumper. The guage should go to empty and stay there. If both tests pass, the sender is bad.