Very easy. Read my article for the E30 Euro Ellipsoid install (wiring is the same way for an E34, just pay attention to the + & - wiring) View that article here:
http://e30m3therealm3.com/
Click on the TECH section & then EE Install
For help on the wiring part numbers for the E34 Euro Ellipsoids, view my other page:
http://e30m3therealm3.com/e34/
Hope This Helps- E-Mail me if you have any questions