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Message: [QUOTE="Austintacious, post: 1545919, member: 32700"] Hey guys, sorry I've been trying to help my parents get moved into a new house and been crazy busy. So I have tried grounding the factory one to both the frame and negitive terminals. If the wire is hooked up to the unit, no changes but if I disconnect the wire and ground that then gauge pegs full hot. Water pump is the older international type. That's what was in the truck originally so that's what I put back in. I did use some pipe sealant on both sensors. I removed them, cleaned up the threads and reinstalled them dry. Still not working right. If I run the truck enough to get the gauges to work again, if I turn it off and restart it, both gauges are where the should be. If it sits more then 20 minutes then they start acting up again. I was not aware there were 2 different senders. That sounds like it may be the issue with the factory unit. I will check it when I get back home. I do not think the glow plugs or wts are affecting it. I can watch the voltmeter jump up to 14 when the glow plugs kick off and neither gauge changes. To add another wrench to the works, I've noticed since I've been here in Texas, the isspro started working properly again. The only thing I can figure is the ambient temperature has something to do with it?? Its been in the upper 80s here and it has been close to freezing back in NM. My dad has one of those laser thermometers from harbor freight but not sure how accurate it is but I will give it a shot when I get home. Thanks for all the help. Definitely gives me some more things to check. [/QUOTE]

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