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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