Where does the Fuel Gauge sending Unit get it's Ground so that the Fuel Gage Works.

mopowers said

A couple hose clamps and a wire will accomplish the same thing if you're in a hurry for a solution.

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THIS!! AS old as these girls are, I would ground the sender DIRECTLY. Solder or clamp a wire, likely easiest near the base of the fuel line nipple, and bolt it to the body. There is no guarantee that the sender has continuity to the tank, that the tank is grounded, or that the fuel line and the OEM clip is grounded.