I made a small app a few of months ago that may be suitable.
IIRC it spits out all the data received from OutGauge patch X spec, including a few things not implemented yet.
Also has calculations for:
Fuel efficiency (mpg)
Range (kind of useless)
Top speed (resets after 10 seconds)
Looks a bit crap so I'm not sure how useful it'll be.
All units are imperial but I can probably compile a metric version - I think I added conversion units for both when I made it.
Listens on UDP port 40000 so you'll have to edit your cfg.txt file to look somthing like:
OutGauge Mode 2
OutGauge Delay 6 (change if you want a different update rate)
OutGauge IP 127.0.0.1
OutGauge Port 40000
Written in VB6, so you'll need whatever runtime thingies needed if you haven't got them already.