Have been working with the E34 GearKnob in my E23. Fits like a glove and slotted right down in the same slot. Only had to cut a small hole in front of the lever to the wire. This way I'll have full controll of the 5HP-18 transmission. Just as the original solution was. Now I'll start on connecting the E34 lever's electrics against the E23's electrics. Two things here: The Stop-start signal and the signals to the lamps in the dash-module. Should be no problem.
The electrics enginewise from M30 to M60 is sorted out, and will be connected the next time the M60 skids back in the enginebay of the E23.