Hunter's 1978 GMC Build
I'm going to apologize for the wire abomination you are about to see. I have some brand new gauges from New Venture made for these trucks. A female adapter to the OE gauge plug does not exist. We took my nearly perfect all original wiring harness and snipped that sucker off like evil people!
I'm also too cheap to buy wires so my dad did all this with salvaged wires from an old s10 harness...
The picture I'm pointing to is a spot where the instructions say there should be a wire for a high beam indicator but I guess I don't have one of those anymore.