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.
Damn you Americans and your cheap games 360 titles are typically £45-50 RRP (US$90-100) in the UK although PC games are usually a bit cheaper in the £30-45 RRP range.
When totalling up prices for LFS licenses, you should probably think about the time-scale involved between versions. So far there have been 2 releases of LFS over several years for £12 each. Compare that to, say, the Need For Speed series where it costs £30-50 (depending on PC/Console etc) per year for a game that focuses on prettiness rather than core changes.
Compared to $2600 of kit, $120 is comparatively cheap but it is designed for a £150($300) wheel, which makes it nearly half the cost (not to mention the shipping which you need to sign up to the site to be able to see) making it pretty pricey.
I understand most of the cost goes to making it light so it can be mounted on the wheel, and also to a smaller extent the materials involved in making the cable for the same reasons. While a moving display is practical on a single seater formula wheel that rarely turns more than maybe 270 degrees (if ever?) it would seem more practical on a 720/900 degree wheel for it to be stationary mounted on the dash rather than the wheel itself. As shifting is very possible while the wheel is at 180 degrees it does seem a little impractical as you wouldn't be able to see the display at all at that angle.
From the images, it also looks to be quite easy to catch fingers on the carbon fibre, maybe even between that and the wheel, coupled with the dual strong feedback motors this has the potential to cause injury not to mention restricting movement due to the bulkiness.
I think Alt isn't a good choice though, as if you want to use an Alt+ macro it will activate it Shift may also be a minor annoyance as it would turn off when using a Shift+ command.
If you add 't' as another way to turn it off would solve the chat problem.
I think the best way to solve the above would be to add an option to change activation keys to fit with the user's preferences.