I just installed this and it works perfect. This completes the "Touring" part of my ride and I couldn't be happier!!
Six wire hook up with the E38 computer:
12 volt switched
ground
hot side brakes
cold side brakes
VSS signal to speedo
ground switch from clutch
Also you have to run 4 wires through your column if you want to run the controls from your turn signal like mine.
Contact Adam Gunn at 479-216-2321 and he can set you up with this.