I have a 2001 Caterpillar 3126b on a 2000 Freightliner XC chassis with an 2001 Allison MD3080 Transmission. What gage functions are supported (i.e. engine turbo boot pressure, engine exhaust temperature, transmission gear, etc.)?
Hard to say exactly but you should get the standard data points (rpm, speed, boost, temps, pressures, etc). Transmission data may be there if the OEM connected the ECM to the engine diagnostic bus or not they connected it to it's own diagnostic bus.
I suggest you ask on the IRV2 forum where there are many users of our adapter as there may be someone with your similar configuration.