N16 II 2.2dci 136 Rev counter problem

Hi! I have a problem with my rev counter. The problem is in the way it reads the RPM. It's not progressive. For a better explanation you can see the video. It was made in neutral, but it works the same way in the other gears. The engine works fine


Maybe it could be a dirty RPM sensor, or this sensor could be damaged?
 
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