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The guage could be off or the sender bad. A couple of other things to check first. Do you have access to an infrared thermometer to check the temp on the upper hose? Is there heat in the car? Is the cooling system building pressure?
If the gauge is off it might be bad, the sender could be bad, or maybe the needle just needs a gentle little twist to recalibrate it. Watch how much it moves as it warms up. It should move about 1-1/2 to 2 marks as it warms up. Normal operating temp is 1/3 to 1/2.
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