Paw Paw -
From your question, is it possible you have either a CS or a CTS? The
truck installation instructions are in the manual for these, or, for the older Gryphon, just as shotgun told you. However, if you have a CS or CTS, you DO NOT use Pegasus! There is a program called Fusion on the CD that you will install on your PC. You will create a "Fusion Account" after you have done this and then you can use Fusion to check for updates or to download custom tunes to your CS/CTS.
As shotgun told you,
please bring your
User Profile up to date! It's very hard to help you when we have incomplete information.
- Jack