Temp gauge mystery

66Valiant528 said

I don't know if anyone mentioned it but I've heard that Teflon tape can mess with them. It is tapered pipe thread so that isn't needed

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Another wives tail, the threads will cut through the tape or sealer and make a metal to metal contact.

Use an ohm meter between the base of the sender and the manifold you will get the same numbers as if you short the leads together.