As Mike mentioned, this ideally would have been done already since the TSB is almost 2 years old.
There's also a Watts Link TSB you should check into as this can be a safety concern, and it can be found here:
2007 Saleen/Parnelli Jones Edition TSBs and Install Manuals - The Saleen Forums at soec.org
I can think of at least 3 scenarios...
If you bought your PJ new and since February 2, 2009, I would be asking the the dealer to handle this for you.
If you bought your PJ on or before February 2, 2009, and it's still covered under the 1-year Saleen warranty, you can apply for assistance from Steve Saleen's new company, SMS Supercars. Information is available here:
Procedure for SMS Supercars Warranty Support for Saleen Vehicles - The Saleen Forums at soec.org
If it's out of warranty, I'd still check with your selling dealer and see if you can work together on this as it should have been done. The cluster will need to be sent back to MJ Acquisitions/Saleen in Michigan for calibration -- which means you'll be without a car for several days. You might call them at 800-888-8945 for more details on what it's going to cost out-of-pocket.
Good luck!