toolman0114
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As you suspect, the black wire is the ground and the tan wire is for the sending unit. With the key on, and the tan wire disconnected, the gauge should go full scale to the right. If you have a 12v testlight, it will show some voltage- the bulb won't be full bright, but it wll glow. And with the testlight in there, the gauge will be somewhere around mid scale. Full ground on the tan wire will put the gauge full left scale.
There was some issue with the sending unit. The tank was about 1/4 full but showed empty. I went through some testing procedures and it seemed to be working. I filled the tank to almost full, and the guage reads between 1/2 - 3/4. So it is working, but not accurately.
I guess the good thing is that when it reads empty, I'll still have 1/4 tank. Is there a way to adjust the accuracy?