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Re: 1972 c10 fuel gauge problem
The gauge works by changes in resistance, so clean connections are absolutely paramount! The sending unit is a typical GM 0-90 ohm value unit. Empty is 0, full is 90. If you ground out the wire at the sending unit the gauge should read just below empty. If you disconnect the wire, it will go way past full. That will test the wiring and the gauge. If that checks out, then the sending unit or the ground for the unit is faulty.
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1970 K/5 Blazer CST 4WD, Bronze, 93k ACT. miles, 350, 4 speed, positraction, 16.5" x 8.25" wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration in progress... 
1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 
2017 Sierra 1500 SLT 4WD, Black, 41k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2...
2019 Canyon SLT 4WD, White, 60k miles, 3.6, 8L45, 3.23 LS, 18" wheels
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