I am about to install a Track Apps Cluster in my 2014 Base Mustang GT. The Mileage matches. I intend to use Forscan. I have tested the Forscan system and everything seems to work. I have four working keys to the original cluster. It seems I am only talking to the cluster in PATS with Forscan. What I want to do is take out the original cluster and install the Track Apps Cluster and run PATSs with two of the four working keys I have using Forscan. The original cluster and two other working keys will be set aside. So if Forscan fails, will I be able to reinstall the original cluster as a back up using the two other original keys or is somehow the ECU has been changed? I am trying to avoid bricking the car.