w211 e320cdi sport speedo

streethawk

MB Enthusiast
Joined
Jun 27, 2011
Messages
1,025
Location
leicester
Car
E320cdi sport
Hi anyone got any ideas what's wrong with my speedo. It will sometimes stick in certain places with a little fluctuation and some time move ok ish but completely wrong and it will also work perfectly but I have to disconnect battery to reset it. Sometimes the rev counter also stops working but on happened a hand full of times. I've replaced the gear ring in the speedo thinking this was the problem. Also a brand new agm merc battery but still playing up. The digital speedo works fine and also the mileage and everything else so iam stumped! Help please as iam pulling my hair out.
 

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