Today, I am the happiest man alive...
Just did this mod to my 2008 LGT Limited, and for the most part the method is the same outlined in the first post.
DISCLAIMER - follow my directions at your own risk, I'm not responsible for your f*ck-ups!
On the 2008, the grey connector is still off of the steering column, but it's oriented in such a way that the wires you need to access are burried a little further up in the dash; so you'll have to remove the black rubber under panel and also the lower most dash panel. You'll also have to cut some electrical tape and sheathing back a bit to get enough wire for the vampire tap (disconnect your battery before doing this).
Test your wires before cutting anything! My wires were the same colors as noted in the first post, red / green stripe, and a light green.
It's like a dream come true, so happy to have taken the 1/2 hour to get this done!