Tom,
The cable really needs to come out and go back in from the inside of the car.The cluster really needs to come out.
The cable is not long enough to allow the cluster to come out enough to unscrew the cable,so you have to disconnect it from the trans first.
Brian.

__________________
Mercedes Benz Master Tech
ASE Master Technician
Diagnostic Technician
Owner of "Behind the Star Inc."
Raleigh NC.
www.behindthestar.com
brian@behindthestar.com