1994 Thunderbird with jumpy gauges

I have a 1994 T-Bird that has jumpy gauges. Every now and then the tack will jump to 2700 RPM and then over 4000 RPM. The motor does not change and no
apparent symptoms in the way it runs. The spedo works fine, but the odometer and trip-odometer does not function at all. Every now and then you will see the volt meter jump.
Has anyone ever encountered these sorts of problems? Any possible solutions? Any recommedations will be greatly appreciated.
Steve
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