Cruise control is separate from odometer... no relation.
Cruise control amplifier is at fault 90% of the time... simply buy a rebuilt
one for $165...
The odometer is something you have to send out to repair... I think most
places is $125 to repair... basically a plastic gear casing broke inside...
so the odometer is not moving. I had this same problem with my car.
Check for vendors at mbcoupe.com