If its an older one, you can fix it with a drop of green 290 locktite. Not red nor blue but green 290. Using the following link, scroll down to figures 11 & 15. You don't need to take everything apart, just pull the speedo and find the gear on the shaft. Use a toothpick and place a drop of green locktite on the shaft so it wicks between the gear and the shaft. Let it cure and you are good to go.
http://www.pelicanparts.com/techarticles/Mult_gauge_repair/mult_gauge_repair.htm
If it is a newer one, Ida Know.
Michael
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Usta haves '69 250/8, '76 280C, 1971 250C 114.023, 1976 450SEL 116.033
Current have, 1983 300SD 126.120
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