I recently purchased a wrecked 2015 PI With the 3.5 ecoboost. Low miles and in really good shape. It was a k9 unit so obviously it needs cleaned and has no real interior in it.. anyhow. I have a 2014 xlt parts car. How involved would it be to add the rear hvac to the PI. I HAVE everything needed from the donor car. Rear unit wiring and lines for under the car. Anyhow my real question is is it plug and play? If I plug it in will the features work with my hvac bezel from the Xlt or is there a lot more involved.?