I just bought a 7" Lilliput LCD from ebay for my car computer that I am going to put together. According to my figures, it will cost 185 for the screen, 42 for a single protocol OBDII scanner (won't have the maneuverability of a scangauge from one car to another), 40 for a power inverter or old laptop with broken screen, and 30 for various things that I will need to install (unforeseen costs).
I am going to replace my current cd player in my Saturn SL with the 7" LCD Touchscreen, this may require disassembling the LCD casing and creating my own molding to make it look like it belongs there (of course anyone with half a brain would know it doesn't belong in a Saturn
).
Current plans:
Old AMD Athlon processor with 256MB of ram sitting around
8.4GB hard drive
Some form of Linux running with one of the scan tools available in Linux
Wireless adapter for grabbing files from network when I am in driveway.
Plan on using on screen keyboard for when that is needed so I won't need a keyboard.
Suspend to RAM or Suspend to Disk for quicker boot up time.
Down the road:
GPS Receiver for navigation system and possibly more accurate mileage readings? Atleast for comparison sake.
Program for playing audio straight from Hard drive or CDROM drive (should be simple, but want the MPG display first).
I will attempt to keep this updated with how it is going.
Fourthbean 
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