I dont think the wiring is as easy as you imagine..
There may be a need to "create" the wiring for the ACC sensor..
And this is where the true "secret" lies mabey
As for fitment / calibration, BMW should be able to do this , if they want to that is .
You are no closer to getting this done my friend, so be aware that an invenstment in all the ACC parts may just be money down the drain.
.. athough it just might be enough to do it
.. but i doubt it
