I have an Xineering Auto-Blip Module for sale $395 $370 shipped
This kit supports 2011+ Ford Mustang & Shelby GT350 GT500 per their website.
Used 1 season on my 2018 PP2 - only 1 track day. I'm selling the car and no longer have a use for it.
It works excellent for those who have a hard time...
My Mustang was totaled. This rev-match device was a godsend and the body contortions you have to make to install it are totally worth it. I can only guarantee it works in a 2016 GT but I'm guessing it works in a 2015 and 2017 (ask Auto-Blip). I doubt it works in a 2018+. These go for $400...