Thanks for all the information! Actually, my car is a 1995 E420, and there is ONLY kilometers for the speedometer, no inner markings for miles...the US version of the instrument cluster has the speedometer in miles, WITH inner markings for kilometers. This is the one that I will have to swap for. It seems the modification must be performed before I bring the car into the US, and receipt for the work must be presented as well when the car crosses the border.
1995 black pearl/black Mercedes-Benz E420