It seems there are a lot of problems with these. My sending unit stopped working and because the system is 12V I thought I'd have no problem using one from a post war GMC engine. I got one that plugged right into the hole in the block and I wired it to the gauge. Nothing. It turns out the model I used was for the dash lamp warning system and not a gauge. It was either off or, when it hit 165 degrees, on. I'm still looking for one exactly the same but that works with a gauge.
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