I doubt it. I would think that it would be kinda hard to be able to read all the types of sensors on a PDA. I do know that FAST has come out with a stand alone A/F meter. Looks pretty nice. It can handle 1 or 2 O2 sensors. I think they are coming out with some other stuff soon too. I had heard something about a setup that would be similar to the "dashboard" in their C-Com software, but would be on a single screen that could mount in the car. That would be something nice to see. Don't know what exactly, just "hear say".
But the A/F meters, which are digital, do work, and I have seen one out there. I think they have some A/F gauges too, but I don't think those are available yet.
Hope that helps.