Bypassing the Amp gauge - Question about the MAD Electrical method

Just thought I'd share a couple of photos of my old harness here, after removing everything last night. Both the main red wire and black wire had done some melting at the bulkhead. Someone had re-routed the red wire through the firewall which was a good idea... BUT, then they merely hand-twisted the wire back together under the dash and used a flimsy piece of electrical tape to hold it together, and left it hanging low and flopping around.
I could hear the wires crackling and sparking last time I went to fire up the car, It sounded like bacon in a frying pan.

I think I got to this one just in time!