Good job your program. I have a chinese 7" gps, and elm based bluetooth obdII reader, in my e12 corolla, and almast ewerything is fine, but little lagging.
I want one feature for this software (or two...)
-Auto sleep the pna when the power off (like an igo8)
-hotkey to switch to the navigation software.
When you want implement this, i promis buy a full version.