Mod7X: Welcome to the site..I'm with ya and I dont trust any of them either..I run a 57 Viking for a friend of mine sometimes when he wants to fish and it must have a short somewhere as it will creep up to full then slowly drop back to a third of a tank and after plane its right at a half of tank and this is after filling up..after 5 or 6 hours of steady trolling it will stay flat at a half of a tank but the port engine tank goes to empty or is all over the place. IT does not bother him but it sure as hell bothers me..Thats why its important to make sure whoever wires it knows what he is doing...The rate of how much you put in and how much you burn at a given RPM range is a pretty good idea should your gauge fail......Frank