Help with Temp, Gas, Oil Alt gauges FREE VIDEO INCLUDED!

So your harness connector for ignition switch leaves a switch terminal unused. I would ignore that. Just for the sake of saying, or FYI .... The aftermarket produces a replacement for later model column mounted switches and attaches a wire to every terminal routed to that switches remote connector. So go to a body with that switch and you have 1 wire more, one wire too many, and in the wrong positions too. This added wire makes a headache when installing that switch where the extra wire wasn't. I'll bet that if your model switch had its on short harness to a remote connector, the aftermarket would put a wire on every terminal. Anyway... Focus on the problem at hand and the hacked wires.
The large red and black should have been tied directly together. Why someone thought hiding a pizzy little blade fuse behind the inst' panel was a good idea? Damned if I know. Current to everything in the car travels that little Z. the wipers, brake lamps, turn signals, cig' lighter, you name it.