Tach reading high

Well, looks like part of the issue is at the ignition switch. When I unplugged the ignition switch connector and wiggled large red wire I got voltage fluctuation. I'll pull DS bucket, ac diffuser and triple gauges. Problem is probably the splice. Next day off I'll try to limber up and get under there. Instead of soldering the wires together, I may try individual ring terminals with a nut bolt thru them.
Anyone know any midgets?