I would think with a 12V 110V house converter & you fed 12V to the gauge & the gauge negative terminal to the sender terminal and the sender body (threads) back to the neg wire on the converter that that would do it. EDIT I'd maybe wanna stick a thermometer into the water to check accuracy at different temps (up to boiling) to compare to the gauge readings but thats assuming the thermometer being used is accurate & the hardware store air temp one I have is WAY off (& a different one was too) so that is a FYI caveat.