A PC using ethernet and VNC would work. But at that point, why have the empeg in your car at all? Just use the PC to play MP3s and also have full screen WinAmp visuals.

Yes, I know the empeg car is superior to most PC MP3 player systems. I'm just saying that if one has already gone to the trouble of car-mounting a PC with an in-dash video display, then the dash-mounting of the empeg is not going to be an issue for them.