Hello everyone and thank you for all the useful info. I've been lurking for many years and finally picked up a MEP-803a. Everything seems to be working properly except the water temp guage. When the unit is running and up to temp, I checked the supply voltage to the gauge which was 26v and from the sender I was getting 12.6v to the gauge but the needle on the gauge did not budge from the far left. I think I was originally getting 6v when the unit was cold but will have to double check that. My question is, did I miss something or is the gauge bad? Thanks in advance.