They will take your first cluster and may reprogram the mileage on it to your new dash. As I recall the cluster must be presented to them before they order your new one. Exhibiting details from 2008 and later OBD2 engines is usually a snap, with Racepak’s optional OBD2 harness. https://cesardsftf.goabroadblog.com/31199655/5-simple-techniques-for-2015-mustang-gt-digital-dash