I hear its either brown/red or white/blue on the blue instrument cluster plug in the 2005, but I can't confirm for sure. Anybody know if its the same on the 06 A4?

speed sensor is on the front driver wheel LHD also called the ABS sensor

Blue/white? I've heard it being on a blue or green molex behind the cluster. LHD stands for...? Lower Door? Thanks for the help BTW!

your welcome, most think the VSS is on the tranny

Well, once my kit comes in, I'll be under the dash looking... Wish me luck!

Found this over on AZ. Looks promising.

http://www.nav-plus.com/instructions/a4b6dash.html

http://www.nav-plus.com/instructions/a4b6abs.html

And after MORE RESEARCH, it looks like I'll need to buy a CANPULSE1/3/4 adapter for VSS. There is no analog VSS pulse in the B7.