Recheck the ground
Hi Terry
Recheck the ground from instrument to body and engine to body. I've had problems where the gauge worked on the test stand and didn't in the truck, what it tracked out to was new paint on chassis and body made for a poor ground continuity, strangely the engine would crank. I've added an extra braided ground strap from engine to frame bolt that the battery connects to.
As a check how about a clip lead from the base of the sender to the instrument panel back.
Cheers Phil
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