What do I need for a proper under-dash rewire?

Don't use black electrical tape for the harness, stuff is nasty after it gets warm/old and leaves residue on the wires. Rod
And acts like a fuse if you get a fire, just ask me how I know that!:mob: I use "racers tape" Flame resistant not cheap though. I would go with the braid if you have access to it we used it on the aircraft in the USAF.