I talked to the guys at Electronic Speedometer Service in Washington state and they said for $125 they can transfer the mileage from a GT cluster into the Saleen cluster and they might be able to change the PATS over too included in the $125 price of the mileage swap. If they can change the mileage and Ford can make the PATS system work then putting in a used cluster should work then, right? Not sure if my thinking is right or not but I still dont have the knowledge about this as a few of the other guys on this site so i could be wrong.
http://electronicspeedometerservice.com/ Thats their website.