Because the cluster is the part which receives the message from the FCIM (the bezel) and the GT500 steering feel button is on the steering wheel...not on the bezel
You don't need to write the VIN to the cluster, the cluster will pick it up once plugged - you can ONLY increase the mileage with Forscan (you cannot decrease unless you've got another tool called UCDS or eeorom programmer)
I'm almost sure that you guys can get rid of the hiss by grounding the ACM, Ford quality is shit.
I have a hiss too, but haven't tried the ACM fix yet.
Take a look at my setup:
https://m.facebook.com/groups/245688985629930?view=permalink&id=1270996539765831
Sorry to storm this thread but I was using Maestro AR with Audison AP8.9, but eventually got rid of the Maestro AR as you'd need to flash the Audison amp with a custom firmware for it to work with the Maestro and this firmware makes lose tons of features of the amp.
Anyhow I'm also experiencing...