I am in process of switching my car over to 12 volt. Most of of it went well but I seem to hit a snag. I bought a voltage reducer for the gauges from work. It is a VRC 604 which I crossed from the napa number. I am wondering how many gauges it will run? Also if it does run more then one gauge, will the gauges read correctly? I called the tech line of the company that produced the part and the guy there did not know how to answer these questions. I think when I told him that I was using it on a 1947 ford he did not understand.