All,
Finally gave up on Bendix Cruise Control, bought electronic unit online and will report on it after installation.
I have the Bendix manual for the air operated cruise, but the manual is lacking on exactly the function of each individual wire. As my installer will splice in to the Bendix harness anyone who has done this who has any notes of which color wires perform which specific function would be greatly appreciated.
Additionally if anyone has done this conversion if you used the existing speed sensor on the Allison transmission and this worked. I have a drive shaft mounted magnet I purchased and will use the existing unit on the Transmission if it will work. The tech support at the cruise control vendor said he would need specific data on the speed sensor to be able to tell me if it will work, and that the cruise control module accepts many different formats of speed pulses. He recommended to use the magnet on the drive shaft as they know for sure it will work and isn't that difficult of an install.
Thanks

All,
New cruise installed, Rostrum unit bought on-line and installed by local car electronic guy: it works great and apparently goes full throttle on uphills quickly as necessary.
Installer figured out and spliced into Bendix harness which is now disconnected. I'll remove it later after the air lines are secured.