Well, my car '81 300CD, has been on a "long" journey of restoration.

• 617.912 engine, AT, 3.46 diff (original, blown engine)
• 617.912 engine, 4spd MT, 3.46 diff (european engine)
• 617.952 engine, 4spd MT, 3.46 diff
• 617.952 engine, 4spd MT, 2.47 diff (W126 diff)
• 617.952 engine, 4spd MT, 3.07 diff

Throughout all the changes the cluster has remained original, until I put in the 3.07 diff which I got from a 300TD along with its cluster. I recently checked it vs. a GPS and here are the results.



I'm curious if others are seeing this kind of error as well with their speedometers...