Joe, A couple of thoughts; You say you've cleaned the radiator but did you shine a light into the rad from the fan side and look closely (from the front) at all the fins and tubes? You might also stick a meat thermometer down into the coolant in the top of the rad and check the temp that way. Would give you a better idea if it actually hot or the gauge is malfunctioning. An ounce of investigation can be worth a pound of guessing and two pounds of wrenching. Also, do a search here for "voltage stabilizer" There have been some good threads here in the past where Rod, Bern, SoTexas Bill and others have discussed the electrical values of the voltage stabilizer that you could check with a VOM. It could also be something like cleaning the little spade connector on the temp sender on the front of the head. A dirty connection there could give false readings somewhere else. I haven't been into the the electrics in the back of the tach so much like the fellows above have though I really ought to learn. One of my best friends is an electronics guru - fixes photographer's strobe boxes from all over North America in his basement - and I just ply him with beer and good conversation while he does it for me. He's one of the last vacuum tube guys around. Giant ones for heat treating. They fly him around some times to fix them.
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