why don't you just get the Dashsoft kit it comes with software, cable, and interface making it basically plug-n-play and its much easier to use I have a e66 and e60 and I use it all the time. The guys on the forum I frequent also use it exclusively, its a bit pricy ($230-$250 on most of the sites) I got mine for $200 from this guy
jay_r@inbox.com and its totally worth it you should check it out do some research on it, see for yourself.