I know the auto trannies on the w123's use vacuum control and a bowden cable for shift control, is there also a version that uses an electric kickdown? Reason I ask is that my 80 has no bowden cable, or provision for one, and when cleaning the driver floor yesterday I pulled the carpet and found a round black button type switch hiding under the accelerator on the firewall, with a flat connector on it. I can mash on the pedal and it never does kick down until I pull the shifter down a notch, been that way since I've had the car.

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Chris
64 190D R.I.P.
80 240D W/617 engine -for sale
82 240D -for sale