It should connect directly via the CeNet cables supplied (CeNet is Clarion's proprietary connectivity standard for their car stereo systems).  Have a qualified dealer connect the cable to your GV's stereo and install the adapter in your glovebox (keeps your iPod secure and out of sight).  For reference, I've attached a picture of the adapter as it sits in my own GV).

_pav

I got it in and it works beautifully!  Definately sounds batter than the road-gear fm x-mitter did, and I get much better volume.  I put mine in the console storage under the hvac... there was a spot for where a light looks to be an option, so it was naturally a good spot.  Really easy to install... setting up the playlists was actually more difficult!

ORDERING MINE T(ODAY!!! I can't believe noone could answer me on if it really worked or not!!!!
EBAY here I come!!!!

A couple of questions for anyone who has the ipod option installed....
I think I read the Cenet adaptor / cable recharges ipods?
Does it also power them on and off when you power on/off your cars ignition?
Also, does it matter what Ipod model you buy?
(I was thinking of buying a 2gb nano)

Yes, it charges the iPod while on.  It does power on and off with the stereo.  any of the iPods that use the new uplink connecter should work.

You guys know about this???
Auxilary cord!!!

http://metatrox.net/GV/modules/smartfaq/faq.php?faqid=11