The problem is usually the leftmost wheel on the total miles recorder slipping on the shaft. The wheels are plastic and over time the solvents leave the part and the hole gets a tiny bit bigger and won't grip the shaft. Diesel Giant has an on line instruction pictorial on how to fix the problem. I used green Loctite and applied a very small amount with a hypodermic needle. Careful you don't vaccinate yourself with the green stuff. The biggest challenge was getting the speedo cable screwed back on when putting the cluster back in.

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Ed
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'81 300 CD
'83 240 D four speed (sold)
'85 BMW 524td
'96 BMW 328is