Quote:
Originally Posted by Greg Reid
Did you check the resistance of the unit? Should be 0~90 ohms full range. This is what controls how far the gauge will move up and down.
The tank itself doesn't really have to be grounded for the circuit to work. The sending unit ground wire is grounded with a screw to the trunk pan. The rubber gasket isolates the unit from the tank, more or less. The positive lug on the sending unit gets the hot wire and it must be isolated from ground but that's built into the sending unit.
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Went thru this a couple of years ago with my 71. It worked with the original sending unit but not with the two Taiwanese replacements. I've had it apart three times now. I didn't think the tank needed to be grounded but wanted to make sure..