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Water Temp Gauge peggs on occasion

My 74 pegges the water temp guage at 260 on occasion. The cooling system is new and I have an EFI computer with water temp so I know the gauge is faulty. I have replaced the sender and ohm'd the wire from the guage to the sender and that is good. So my question is what is inside the guage and is it something that can be cleaned or repaired? Or should I toss it and buy a replacement?

Thanks,

Steve
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