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Temp gauge problem

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Old May 13, 2009 | 03:23 PM
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ocstanley
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Default Temp gauge problem

I have a '72 350 and recently noticed that the temperature gauge doesn't read higher than 120 degrees. I replaced the sending unit and continue to get the same problem. Next, I grabbed my volt/ohm meter and checked the gauge with a 5k ohm potentiometer. I discovered that the gauge worked properly for simulated temps between 210 - 250 degrees, but continued to stay in the area of 120 degrees for simulated temps between 100 - 210. I have cleaned the gauge's contacts -- the problem remains. Is this a common problem with older gauges? Do I need a new gauge or is this something that I can fix by myself? Do I need to go to a restoration facility? Please help.
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Old May 13, 2009 | 04:44 PM
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...Roger...
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Is the resistor on the back of the gauge good and reading around 90 ohms?
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Old May 13, 2009 | 09:57 PM
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ocstanley
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Default Looking for resistor

Not sure. On the back of the gauge is a small wire-wrapped, rectangular strip. Is that the resistor? Thanks in advance for any help. This thing really has me frustrated.
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