Looking for help with a water temp gauge on a 2004 21i. Recently, the gauge started to read high. I’ll run the boat and it slowly climbs to 250. The gauge also starts right around the 175 mark. The gauge will slowly climb and it stays pegged the whole time. I’ve chased the water flow system from the pick up at the bottom of the hill all the way through the thermostat. Everything is clear and I’ve replaced the impeller. I’ve also shot it with an infrared gun and temps seem normal. Does anybody know if it’s a sending unit or gauge issue. If it’s a sending unit, where is it located and if possible does anybody have a part number. I’ve searched endlessly online for manuals and diagrams and I’m having a hard time finding the correct parts. Thanks