Temperature sending unit problem.

slantsixdan said

Also, I had one of those awake-at-3am thoughts about this: you don't happen to have used Teflon tape or thread sealant or anything else on the sender(s) you installed, did you? That needs to be a clean metal-to-metal junction because current has to flow.

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The original unit that was in it when it worked does look like it had some kind of sealant but there isn’t anything like that on the new units I got. This is what to original unit looks like


The new units are just bare metal contact. I actually see two points where it looks like sealant was put on. The obvious red looking tape and also the gray area above the threads.