Start with the interior dash harness. If it's correct you can lay it out on plywood, unwrap and replace wires one at a time and rewrap.It seems daunting but 1 wire at a time and you'll get better at it. I dread wiring but in the end I enjoyed doing the modifications on my 68 Hardtop.You probably have all the wires you may need with that kit.(Not my Pic just sole it for an example)
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