The needle on my temp gauge (round gauge) on my 853 never moves. Even after running for hours in 80 degree weather. I have found quite a few problems with this machine I inherited. The gauge is getting power. How do I check the gauge to see if it is actually working? Would I remove the ground wire then short the gauge to ground it and see if the needle moves? How would I check the sensor to see if it is working? The sensor only has one wire going to it. Thank you I appreciate the help! Greg