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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