I've been thinking about a Parrot kit too... Is this the one you've got: http://www.mobilefun.co.uk/product/6107.htm
I was thinking about the one with the display.
Anway, you didn't happen to take any pictures? Could you describe the cables and what you connected where? Or is it obvious?!
I've been taking the panels off to get a phone holder and charger in place, along with a Geodesy and a USB power plug for my eTrex Legend GPS (or anything else with USB)... and the panels are a nightmare! I've now got them neatly on the dash - but I haven't bought a dedicated eTrex cradle, and the charger for the phone doesn't work... it's for a K700 not a P990i
When I have a bit of money I'll install a BT kit..
I'm thankful for any tips