Been having this sad situation for the last month. Don't want to get caught by speed traps or the cops because it lasts for a short time only, the needle sticks to the end post like there's glue on it. At a certain speed, possibly 40kms as someone tell me( a techie), the needle will burst forward and register the right speed again. What the hell! How can I fix this cheaply without replacing the whole cluster or speedo. I also think my speedo is not accurate because everyone seems to be overtaking me in a 100kph zone and I look silly. The only 2 highway speed check gantries are 100kms away in 2 opposite directions from where I am. I can try this or is there another easier way???

I read a post once on this forum that described your exact same problem. Something about the paint degrading and becoming sticky. Search for it and find it. The fix involved removing the speedometer, cleaning the post off, and painting it with super glue I think (keeping the needle off of it until dry of course) You'll find it if you search...

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1982 Mercedes-Benz 300CD
1982 Mercedes-Benz 240D - stick