hey guys, this is a real common type aftermarket gauge and sending unit like what you would see for an auxillary fuel tank in a truck or for a boat. i lost the distructions so i don't know how it's wired. anyway, there's three posts on the back of the gauge, one is 'G', presumably for ground. the other two are 'I' and 'S' if i remember correctly.
i've done some searching on the web but haven't been able to come up with any instructions. what i'm thinking is 'G' is obviously ground so ground to there and the ground on the sending unit. then 12v switched into 'I' and from 'S' to the sending unit.
i just don't want to spark things up on a fuel tank if you get my drift.