1- Open the Driver San Francisco\Input\0x046d folder you'll find two folders and a file named 'description'. Copy and paste the 0xc295 inside the same folder and rename it 0xc299 if you have a G25, or 0xc29B for a G27.
2- Make sure you have the "Pedals Reported As Combined" unchecked in your wheel's Windows controller panel.
3- In case the steering doesn't respond when you satrt the game, alt-tab to desktop, go into Shift mode and come back to the car a few times till the steering responds. Once it starts it's fine. "