Its quite simple
1. start up ps3
2. press ps button on your gamepad
3. connect wheel
4. start up gt5 and you'll have the g27 for driving and the pad for al your phototravel and photo mode stuff.
My older pedals don't work with my DFGT such a shame now I actually have to wait for the mail from loghitech. So I can get the requirements to get a new DFGT from them.
Why does it take a freaking day to send me an E mail?