I bought a restored 55 Monterey.  It has a 12 volt conversion but is otherwise stock.  It has a number of show plaques from the last few years and I assume from the overall condition that it has been driven for at least a few years after the restoration.

The temp gauge pegs out at max when the car is started and come down to 3/4 when cruising.  The oil pressure gauge goes to 80 and stays.  The volt gauge goes to the center when running and moves toward D when the engine is revved up.  I thought the gas gauge was reading incorrect at 3/4 tank when empty but that may not be the case.

The temp and oil are reading way high and the volt meter seems to be opperating oposite of what I expect.  Is this a symtom of the switch from pos ground 6V to neg ground 12V? 

I have read about putting the oltage regulator on the gauges for the conversion.  I do not know if that was done.  If I do this is there a guid out there on how to wire it to the gauges?

Thanks