This might be what you're looking for:
Hardware
here.
Software and more hardware
here.
(I haven't used those yet myself, so I can't vouch for them. By coincidence, I had been researching this stuff in the past few days in preparation for a carputer that I'm planning to put together.)
Edit:
Here's a
Bluetooth OBD interface. Too cool.
... But again I'm not sure if that's the kind of thing you were looking for or if you already have what you need. ... Looks like the thing you linked to is a lot more comprehensive than OBD.