I know this is an old thread but I am working on tackling this project with my truck right now. I had to order the 6 sensors, the main module, the wire harness for the rear and the two harness for the front. Also had the get the information display and the sonar button for the dash. I found the sensors for $22 each. All in all I have about $400 in the system. It looks like all the factory harness are in place for every thing else. Just plug and play. I'll let everyone know how it works out. I'm still waiting for a few pieces to come in the mail. Maybe next week.