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Message: [QUOTE="Austintacious, post: 1545403, member: 32700"] Hey guys, I've been having a strange issue with my factory engine coolant temp gauge. It started about a year ago. When i first start the truck, the needle pegs all the way to the right past full hot immediately. after running the truck down the road for 10-15min it suddenly will jump to around where it should although it still reads a bit high. Before it started it would normally sit between the "N" and "O" on the normal. now, when it does work it sits between the "M" and "A". I replaced the sending unit. No change. I tested the wire for breaks or shorts. all good. I gave up on it and added an isspro aux gauge to my pillar and just lived with it. Last weekend I replaced my water pump and noticed there was another small plug on top of the water pump right in front of where the factory sending unit was. So i decided to move the sending unit for the isspro from the body of my coolant bypass filter to the water pump. Now the isspro is doing the same thing as the factory gauge. it just pegs full hot and will stay there until i've run the truck a bit. both the factory unit and the isspro seem to "snap" back to where they should be within 30 seconds of each other. I thought maybe it didn't have a good ground so i ran a test lead off the - on one of my batteries. Still didn't change anything. Anyone have any suggestions? I'm completely stumped. I would think if it was an electrical issue they wouldn't work at all right? Truck is a mostly stock '95 with 182k on it Any help would be appreciated Thanks! [/QUOTE]