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For your consideration; https://www.rbracing-rsr.com/wiring_ecu.html Although if you do it that well maybe the replacement cost will look competitive. Interesting info though especially about water ingress. The struggle is real.

The tone generators I use are a little box which plugs into one end of the wire and a "wand" that you can wave over the wire. It works through the insulation based on proximity. So you can hookup at the dash then go in the engine bay. It'll beep louder as you get closer to the wire. They are...

If you do want to make a run at tracing the old wires, I find a tone wand to be helpful for this problem. Disconnect the battery first.