'05 Sunfire Erratic Temp Gauge

I have an '05 Sunfire in which the temp gauge has gone erratic. When the prob 1st started, with the car cold, the needle would read something ridiculous like 200 degrees, then just climb from there once the car was running. The temps seem normal. Now the gauge is pinned all the way to the right, all the time. Anyone know how to fix this?

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WaWaZat
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