Congrats on the new/used truck!
What you'll need to do is get the other cable.
Cables can be purchased from either Edge or PHP.
After that goto pegasus and update the gryphon, which will wipe out your custom tunes for the old truck and allow you to use canned tunes while you wait for new custom tunes. Then you need to get the truck's Hex code and email an order form.
Hope this helps.
Peace!