The screws that hold the clear plastic cover on the passenger side. I had just tightened them in a normal manner and found the gears would not move. So I released the tension on the screws two times before the gears would work and they have been working fine since.

Ok thanks. The only thing I removed and tightened was the potentiometer. Not sure how that could affect it, but I thought perhaps it could…

No idea why it started slipping on mine. Not keen on removing the cluster, because the speedometer needle is never as bounce free afterwards…

Thanks!

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Current Diesels:
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1985 190D (169k)
1991 350SD (116k)
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