I don't think there is an inductive pickup on the trans, there is a electric solenoid on the rear, I think it's the kickdown solenoid. if you look on the drivers side of the tailshaft, there should be the hole and clamp for the speedo cable. The pickup for the cruise would be either in-line with the speedo cable or part of the speedo head. I am confused why you state "no odometer/speedometer".You mean none of it works, or you don't have one, or what? This is all very specialized work, most moderate sized communities have a speedo repair shop, try calling your nearest MB dealer to get a recommendation for a speedo repair shop.
Gilly