http://www.youtube.com/watch?v=UgvNER7GO64

http://www.vitumo.de/

Info

It's an addon for GTL/GTR2/rFactor/GSC/Race07/GTR-Evo (Steam only! Version: 1.2.1.10) which lets you display some useful informations whilst driving.
In Particular:

MoTeC Data
--- Tyretemperatures (In/Mid/Out)
--- Tyrewear
--- Tyrepressure
--- Enginetemperatures (Water/Oil)
--- Braketemperatures
--- Engine Health
Session Info
--- Track- and ambienttemperature
--- Session length (remaining time in a practice session or laps in race)
--- Fuelconsumption (for last lap / average)
Advanced Timingstable
--- Driverslist and their postion
--- During practice the fastest laps are displayed
--- In Race the gaps are displayed according to yourself.

I'm gonna be buying Race Injection - it contains all the expansion packs for Race 07 an costs £2.54.

Overwrite this file:

C:\Program Files (x86)\Steam\steamapps\common\race 07\GameData\Teams\DRIVER_HELMET_FPVISOR.DDS

With the file here:

http://www.virtualr.net/race-07-getting-rid-of-the-helmet-view

http://www.youtube.com/watch?v=IxO0UUyULuw