Thank you all this is helpful. The title partial in retrospect is a bit inaccurate. I am not looking to run 24v, just use an original wire harness mostly I want as much original type equipment as possible (or a reasonable 12v facsimile). Definitely not dual voltage as that just screams nightmare. Fi...

Greetings and glad to be here. I have an M37 that had a hack job of a 12v conversion done to use a Chevy small block and a new 24v wiring harness that I also acquired. I want to use this new mil-spec wiring harness to replace the rats nest of miscellaneous wiring and get all the switches, dials etc ...