There is a way how to put more info on single screen at still reasonable budget,
including custom ASCII art, larger fonts, etc. Perhaps might be worth to investigate
compatibility with your production board before release..
This is the TV-output (PAL/NTSC) shield called TellyMate
for Arduino, which could run various mini screens/LCD panels, many code samples here:
Batsocks - TellyMate Shield
Batsocks - TellyMate Shield - Examples
Now incl. new firmware for larger/custom fonts&graphics:
Batsocks - You could get by without us
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as seen on this thread discussing Arduino Mega and ARM9
platforms for port of the OBDuino code:
http://ecomodder.com/forum/showthrea...tml#post131585