Can you post up a vid clip of the gauge in action.
It may be just a lambda fault.
The other thing to try is disconnect the lambda and see if the gauge activity changes.
The voltage going into the gauge is provided by the lambda sensor. The lambda sensor generates a small voltage due to a chemical reaction to the oxygen content in the exhaust gasses. It doesn't need to be connected to the ECU to provide this voltage. The ECU just reacts to what voltage it see's during idle/cruise to fine tune the fuel mix for emissions purposes. The car will run fine with it disconnected.
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