On the clock, there is a power lead that is connected to the rear and a fuse. The drive cable from the tranny drives the ODO. If the speedo works, but not the ODO, you need the speedo reworked.

------------------
Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM