I have a Pnk wire for systems 30 that was loose (with a female terminal on it) at one end and terminates at the instrument Gauge connector (plug) on the end where two pink wires are located on the same terminal (the other pnk wire is a loop).
Then there is a pnk with black strip systems 39 wire connected to the fuse box inside cab firewall connector and it terminates where the wiring diagrams say the pnk wire systems 30 is suppose to go (believe it was like this from factory). This pnk black strip wire terminates to a splice in the harness about a foot from the firewall connector.
I am doing right by connecting the pnk wire system 30 to where the Pnk black stripe wire was (according to the wiring diagrams) and by moving the pnk black stripe wire system 39 where the diagram shows, it puts pnk black strip wire in a spot where there is no male terminal on the engine side of the firewall fuse box connector.
All the other wires check out in these two systems according to the diagrams.
My truck of course is a 1981 Chevy K10, 350 Engine, original engine was a 305. Did not have A/C, however I am installing A/C. Has Gauges!