1968 Plymouth fury III BULKHEAD HELP

I have a 68 ply fury 3 like the title above lol it has a burnt wire on the second connector near the middle should I do the ammeter bypass and rewire the harness upfront how can I fix it and not look bad or cheesey someone on hear said to use some kind of cleaner I can’t seem to find or remember the name in a little jar it’s red I can remember it starts with Diox or something like that

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