Something is wrong here
If grounding the sending unit wire makes the guage go to empty, plugged or un-plugged wont make any difference, ground is ground.
Something is not getting checked right. Ground the tan wire going to the guage and what happens? No other ifs, ands, or buts.
The connector has nothing to do with this test, just dead ground on the wire TO the guage.
If the guage goes to empty, sending unit or tank ground is bad.
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