Yes,
If Saleen is not backed up they can usually re-flash a customers comp. and turn it around in a couple of days for a fee. Of course you have to be able to verify that you have an authentic car.
Gear swap is the second biggest reason for re-flashes at Saleen right behind re-flashes for too much detonation. I had to have my N/A 02 Saleen re-flashed because of too much tune/detonation shortly after taking delivery right off the floor of Beverly Hills Ford. 91 octane is just about the best we can get in So. Calif anyway. (next to race fuel) In California they used to not re-flash a car that was supercharged. I believe they will now and I don't have an answer for that. That is the reason 3.55's is not an option on S/C cars here. Emmisions is also the reason the S351 was discontinued.
There is a guy who has a 87-93 authentic Saleen cluster on E-Bay right now. His name is Charlie and he is back east. E-mail him. He has lots of interesting Saleen parts. He may have an authentic cluster for a newer car. Just a thought. Oh, and he is legit.