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Old 05-16-2018, 01:29 PM   #2
Dead Parrot
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Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,461
Re: 1977 C10 Gas Gauge

Gas gauge reading at 3 o'clock is almost always a bad connection somewhere between the gauge and the ground stud off the sender on the tank.

Open circuit - 3 o'clock reading.
Wire shorted to ground - empty reading.

41 year old wiring has lots of places for corrosion to do its thing. If dual tank, switch is also a prime suspect.
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