On to next thing on my new 87 tdt -- W124. The speedo is about 10 mph slow exactly when checking with gps. I searched and didnt find anything.

Thanks for any help. I'm trying to find in fsm how speedo works.

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius