I have fitted the S38 3.6 liter M5 engine into the E28 535IM engine bay. My friend is doing the wiring on the vehicle. As far as I know as he explained the fuel pump relay doesn't get triggered as well as the starter relay. I have got the complete engine harness for the E34 M5 and he has integrated the loom to the E28 body. I would appreciate if anyone could supply me with a wiring diagram with pin outs of the loom. If there is any cost involved please let me know.