Re: Sending unit 68 pick up
the test light isn't telling us much, but the fact that your guage goes to empty when you ground it (with the light) tells us that your guage is getting power, and working, and the ground wire that goes from the sending unit to the guage is all good too.
I would pull the sending unit out and see if the arm is stuck, then I would probably look for a good used one personally.
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