Romraider logger does have gauges but pretty basic and cannot be set full screen
Dashcommand for $24 but will need an OBDII Cable, laptop and VGA to Composite converter.
http://www.palmerperformance.com/produc ... /index.php
[img]http://implux.net/~alz0rz/images/rx8/carpc/gtrdash1.jpg[/img]
The only problem is that you will still need a keyboard and mouse or some other HID to be able to control the pointer on the laptop. You could use a cheap usb-base IR media centre remote (on ebay for $20) though.
EvoScan now also supports Subaru and have some nice virtual dash displays :
http://www.limitless.co.nz/#EvoScanGPS
[img]http://www.limitless.co.nz/EvoScan/images/CoolGaugeLayout.gif[/img]