1989 Mercedes Benz 300e

Interior problem
1989 Mercedes Benz 300e 6 cyl Two Wheel Drive Automatic 147000 miles

I have a 1989 Mercedes 300E. 147,000 on the odometer. The odometer hasnt worked since I bought it about a year ago. How can I troubleshoot the odometer. Any tips on what could be wrong with it and what to look for.
June 5, 2009.

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