I heard that the gauges in my 55 would work on 12 volts but someone did not know what they were saying as the temp gauge never worked right after having 12 volts run through it,it starts out about 1/3 up and them pegs all the way over to hot but before I hooked up the gas gauge I installed a IVR in line to the gauges and the gas gauge works fine so I hope I only fried the temp gauge.  I picked up a NOS temp gauge off ebay cheap and as soon as it comes in I wil install it and see if I have a correct reading temp gauge again.

Butchering up everything I can get my hands on in Dayton Ohio