I have a 2000 Monterey with a 5.7 volvo. The temp guage works about everyother time. We had a mechanic look at it and said it was the guage. They bench tested the guage and said it worked but when they put it back into the boat it did not work. So they ran a new wire from the engine to the guage and told me that it works intermitantnly. After getting the boat back, the guage still works just occasionally and when it does work will only go to about 110-120. My questions are what should the normal operating temp be for this engine? Second, I looked at the engine to verify that they ran a new wire. I can find a new wire runing to a bolt or sensor that appears to be under the water housing on the front of the engine. But I also found another wire pluged into the top of the same housing that is not connected. Does anyone know what this second wire is and shouldn't it be conected to something? The last question is since they pulled the guage and ran a new wire, the guage does not illuminate when the dash guage lights are on - did they not conncect it correctly? Any advice before I call this mecaninc back will be very helpfull so I can at least know what I am talking about. Thanks!