I have a mxz 670 and just installed a temp and fuel gauge. The fuel gauge works awesome but the temp gauge a different story. The kit number for my sled is 861755700 but is no longer available so I purchased one that is very close. The one I bought is part number 861760800 and am not sure what it is for but the instruction manual makes it sound like an MXZ since it lists engines 670, 583, and 494. The part numbers for the two kits are identical except for the gauge and the wiring harness which wasnt used on a 670. Anyways to the problem I started my sled today for the first time since install and the gauge climbed up after about 2 minutes. After 4 it was redlined. It was at idle in the garage and I have never seen the temp dummy light go on for my sled. However when this is installed the dummy light is inop. I am wondering if maybe the gauge is the difference that is causing the problem, maybe resistance, red line area, I dont know. The coolent is full and I waited until the thermostat opened at least it took some coolant then turned it off for a nasty fear that it is really overheating. When I switched the sender a little coolant came out before I could cover the hole but not much. Do i need to bleed the system, is there air maybe in the system that is making it over heat? I have no idea what to do please help...