I am ripping out a shit ton of unnecessary wiring I found under the dash. Car is apart but should be back together ASAP. I know I have something loose or some kind of electrical interference because my tach will jump 2-300 rpm's while cruising. Popped a fuse one day as well that caused the cluster to turn off so something is not proper as far as wiring.
Wish I had a FSM to find out WTF all these wires were bro, lol. I will see whats up. Lots of things were cut and spliced so time to clean it up and hope I can diagnose the breaking up issue. It has to be wiring.
It might be easier to decide what you want to keep and work to separate those wires and hack everything else as opposed to trying to figure out what everything is at one time.