This is exactly what I did and I will tell you what I did wrong.
I don't know how the back of your Head Unit looks but there should be a 24 ping and a 12 pin. You need to tap into the 24 pin on the FATTER orange wire. I made the mistake of going through the yellow wire at first but I quickly knew I did something wrong. After that attach the grounds and everything. The module itself isn't long enough to go to the glove box so I slipped it right under my head unit and I can grab it and pull it down or just slip it back up from the passenger side. I took the iPod cable itself and ran it on the bottom left side of the carpet and plastic (very simple) and up to the container thing in the middle.
If you need pictures let me know!
Here is the cable I used to charge and hook up to the RCA.
Ipod Digital Cable Charger & 3 RCA out for Audio & Video
You need to tap into a power source and a ground. Also, I tapped into the ground for both of them on the bolt on the passenger frame by the feet.
If you have any questions at all let me know!