Tony,

You can use anything that can read DDEC III, which I think your coach is. The readers I have seen and the one I have uses a software cartridge for the specific application including the engine, or transmission or ABS.

I just have the software for my engine and a separate cartridge for DDEC I.

They pop up on ebay from time to time and even if it does not have software for your engine, it can be purchased for about $250.