Check with Cummins Tech Support and/or check their website. I recall that Cummins has a PDA set-up with the software and such to see codes and performance stats. I almost bought one when I first got my 98.5 24V Dodge. I am not sure what they offer now, hang on I will check their website, they got tons of stuff.

http://powerstore.cummins.com/electronics.html

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79 240D (no name yet) 203K Miles Maple Yellow
98 2500 4x4 HD Dodge 24 Valve Cummins TD
83 Chevy Van (Dead-Trans. shot)