Tom, if it's a Canadian UC then your gauge is doing exactly what it's supposed to do. Ignition off, with no current going to it, it reads all the way to the right (ie. max). Switch the ignition switch on and the needle, now with current, goes all the way to the left (ie. cold, assuming the engine is cold). As the engine runs it shows the temperature of the engine. I expect if your gauge is reading hot after a good run hill and dale it's because the engine really is hot.
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