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I have posted a few time since I have had the car about the temperature gauge, I've had the car for a couple of years and always had the same problem, I do have a replacement but its not a simple swap.
The gauge sometime will operating normally then you look and the needle has shot far right, sometimes it stays there for a few days or it might go back to normal as I'm driving along or flicks back the next day when I turn the key.
The only way I can make the new gauge on a test rig do the same thing is if I remove the earth.
That is because the connection at the engine IS the earth, or ground as we call it here. Could be your firewall connector getting loose or a bad sender on the engine.
Remove and clean the fuse and fuse clips. My '65 worked properly on and off. I replaced the sender.... same results. Removed the fuse, which was corroded, and never had the problem again after the fuse and fuse clips were cleaned.
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