After reading up on the subject I just wanted to validate my conclusions. The 98 pcm is an orphan all by it's lonesome. The newest software 7.3 allows some functionality for 98s. To gain full access to the custom OS's you will have to upgrade to a later PCM.
I have a 98 helm manual...short of buying a later year manual for the wiring diagram surely somebody has already researched this? I am just trying to establish a cost benefit ratio for this. Thank you.
Harrison