Dan, great insight. I was looking to do something similar before I found out about the Opengauge project. One thing comes to mind. Is it practical for instantaneous FE or is it just for data logging?
I think in the long run the Opengauge will be more practical. But this can have it's uses. I've heard of people hooking up car pc's with OBDII ports. That could be interesting too since most of the time they create a display for it.
Here is a link for a cool car pc concept.
https://www.timekiller.org/carpc/index.php