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If the GMC is the same as Chevy for wiring color, all the instrument lights are grey wires on the back of the instrument panel. If you pull the instrument panel out you may even find a splice you can tap into with out cutting wires. The splices are wrapped in tape.
Larry
68 C20 327 daily driver
63 C20 292 Camper truck
65 C10 ? Custom Cab AC,PB,PS,$flasher
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