I've got J1850 going over Bluetooth (and my 10Hz GPS) so I can get RPM, gear, turn signals, etc. I'll have the instrument cluster done when I have some free time. For now, I just save all the data to KMZ files to review in Google Earth.

One reason I got the N810 was the transflective screen.

(The speakers are from my DockNRock - I still need to do some wiring and shielding from vibration and 75mph insects).