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Bad t-stat, bad gauge, bad temp. sending unit, low coolant, bad radiator cap all come to mind.

Coolant condition will tell you something else too. It could be the coolant sensor is caked with sludge from a poorly maintained system. It would read a short all the time which pegs the gauge. Also could be a shorted lead in the harness or shorted board on gauge cluster

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Q: Why does the temperature gauge in your 1994 century always read hot?
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