Hi,
I think the best way is to hook up a cheap 7"-9" TFT as 2nd screen, and run an OutGauge-app on it. Costs about 100-150€ (those neat monitors crazy people build into their cars...). I've seen some with 800x600 or more, even 16:9 versions are available. If you spend some more, you get one with touchscreen...
I recently played around with my mobile, wrote a small java-app which connects to a small script running on my pc, sending outgauge data to the mobile via bluetooth. It generally works, but as my java skills are quite lame, I decided to give it up. Anyone interested in the sourcecode?
Currently I work on a configurable outgauge dashboard app. There is a set of gauges (ie. analog round gauge, 7-segment display, ...), which can be positioned on the screen, with configurable colors, background-images, etc. and then hooked up to some values provided by outgauge.
The configuration is stored in an xml-file:
<LFSMon width="800" height="600" bgcolor="50,50,50">
<SevenSegment for="gear" x="10" y="10" size="100" off_color="0,0,0" on_color="255,255,255" />
</LFSMon>
.. You get the idea?