I just purchased a used 2018 GT that was originally from Canadia. (rental car from Enterprise). Other than the speedometer, and the DRL, I don't notice any difference. Using FORScan, I was able to turn off the DRLs, but the digital Insturment panel would have to be replaced if I want MPH to be the primary readout. I had assumed it would be a simple re-flash at the dealership.
2007 4.0 V6 Mustang, Victim of Black Ice
1989 2.3 Fastback, traded for:
2011 3.7 Pony Package, Traded for:
2018 GT 5.0 Premium