If the gauge is all the way to hot, and nothing bad is happening, like blowing steam, loosing coolant, smelling hot, then I would suspect the gauge.
If it's an electric gauge, could be the sending unit, or the wire is shorting to ground. When the gauge is showing hot, unplug the wire from the sending unit, it should drop to cold. If it stays up, look the wire over for damage, pinched, burned, mouse chewed.
If it's a mechanical gauge, unlikely it is giving a false high.
When the engine is up to temperature, you should feel hot air coming through the radiator. If the air is cold, there is no circulation. Could be low coolant, failed thermostat, clogged radiator, rare cases a failed pump impeller.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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