Any one help me out here, I need the selinoid to switch tanks electricaly. You know the one , to change between tanks with the switch on the dash. I went to NAPA and they could not find it. I remember reading somewhere they had one with 5 wires and one with 3 wires , 5 wires CG approved and 3 wires not... I need a tank switch . I f no part # how about where to get one?