rec.autos.simulators

The answer is, yes, you can get them to work.  I have used CH Pro Pedals with
various CH sticks with GP2.  I'm sorry that I cannot give you a detailed
procedure off the top of my head.  But rest assured, it does work.  Basically,
you have to go into the advanced control screen, and set the accelerate and
brake device by moving the pedals (with the pedals in car mode, the switch to
the left).  The problem comes when you get to the calibration screen.  You
have to move one of the pedals in the reverse direction.  That is, start with
it down, then release it when prompted to move the controller.  I forget
whether it is the brake or the throttle.  There aren't too many permutations
to try.  You'll find if you get the wrong one that when you go into the sim,
the in-car menu will toggle thru all the options quickly (tire, garage, race).
Sorry for not having the full info, but I hope this gets you going if no one
else replies.

I did use them before, and it required me to get a CH gameport. I don't know
if that is still the case, but they are actually VERY good pedals once they
are working. The wheel on the other hand is far too sensitive and you will
probably be forced to accept using steering help.