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I thought his name was Rob?

Nice table of ampacity: American Wire Gauge table and AWG Electrical Current Load Limits with skin depth frequencies and wire strength

My gasser harness uses 14 gauge wire which should be fine for most any normal 12V loads. I'd be more concerned with the light switch but that could also be replaced with a 12V equivalent IF it fails.

Senders aren't 12 or 24V; they just change in resistance with what you are tyring to measure. Hoever, the guage will need the appropriate voltage. It may be easiest to get a matched set from the aftermarket. I would probably just gety a mechanical oil pressure gauge. Starter wiring will be fine...