I had plans to use this to add the Garmin GVN53 black box but ended up going another route for GPS.
This unit is capable of adding 1 composite video source in addition to a backup camera. If you are unfamiliar with the functions of this video adapter, take a look at the below thread as the OP used the same exact box to achieve his results.
08 Base Model Premium + Nav Conversion - MyG37
This user was able to add a Magden unit using a similar box...
Magden Performance Computer Setup - MyG37
This unit is brand new and retails for $200, however the cable is not included which is why I've priced this BRAND NEW unit for much less. The reason the cable is not included is because I let a friend borrow it and he ended up keeping it for his setup.
You can construct the same cable for ~$10 using molex connectors and a standard DB-9 connector using the instructions below. You may even be able to purchase one through PAC themselves and I'll be happy to help the buyer with any questions that they may have.
http://www.pac-audio.com/PACProductD...ons_071706.pdf
I'm asking for
$110 SHIPPED (Make offers, this needs to go) for this video adapter since I bought it for $200 + Tax and it's still brand new just missing the cable.