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I have the opposite problem, which only occurred since I swapped clusters for a 996 cluster. Mine consistently reads optimistic, which I have concluded I need to go through the calibration process and that should cure my situation.
In yours, I would first pull out the sender, look at it, clean it, test the voltage it puts out, and see if that doesn't help. If the sender appears to be working properly, you may need a recalibration.
Patrick
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