Hi Ritzo,
This part of the above guide is useful:
http://media.tumblr.com/tumblr_m9f09hBwBe1ro4yis.jpg
....as when you press the throttle, you should see the RH red vertical bar increase etc. If it doesn't reach the full extent, then maybe your device needs calibrating.
Try looking in the control panel for gaming controllers (sometimes under human interface devices). You should find something that allows you to see the steer angle and pedal positions...
e.g. For the G27, there is this.
http://forums.logitech.com/t5/image/server...pbl-1&px=-1
The G27 doesn't need calibrating but if you have something different, there may be a calibration sequence you need to follow.
If you get really stuck, let us know what wheel it is and someone will be able to figure it out.
Cheers,
Bagoo