UPDATE: Checked black ground wire coming from fuel tank. Just as I suspected, clean as a hound's tooth. Ground on that end is good. "Watch a You Tube video they said, it'll show you how to do it they said. "
1982 K-10 (4x4). Replaced all gauges in the instrument cluster. Old/Original gas gauge did work, but needle was broke off. Got a new gas gauge and printed circuit board from LMC Truck. Now gas gauge pegs at 3 O'clock.
Everyone blah blahs about poor ground or pink wire this and pink wire that...