1991 Seaswirl 370 hp 7.4 454, temp guage will drop to zero and then start working again, the problem is intermintent, I have wiggled the sending unit wire and all three wires on the back of the guage with no success, it will just start working in a minute or two and then when it feels it needs a break it takes one. Does this sound like a sending unit or guage issue? maybe a power issue? Where would the experts start looking. Thanks
