Jan,

what production year?
This is for E23
http://shark.armchair.mb.ca/~dave/BMW/e23/
E32
http://shark.armchair.mb.ca/~dave/BMW/e32/

for older 750 ECU pinout
http://www.bimmerboard.com/forums/posts/155581/
X20 and X20 pins on 750
http://www.bimmerboard.com/forums/posts/150402/

More you can find here
http://www.bimmerboard.com/forums/e32/

and
http://www.bmwwikiwiki.com/perspecti...rldwide%20Wiki
http://www.bimmerboard.com/forums/e23/