Mine screen indicated 9 axes because I have another joystick connected
Try to unplug your wheel and uninstall Logitech drivers... AFAIK LFS gets info about axes position from windows driver, so when the driver is OK, LFS should work too. By the way, should the Momo had only three axes? Do you have SEPARATE brake and throttle axes allowed? If your Momo has three axes enabled(Brake, Throttle, steering), you should set it in LFS. Also ARE YOU 100% SURE that you DONT have enabled mouse steering? I am not saying you are an idiot, im just trying to avoid simple problems....
BTW, do you have any other game device(joypad, joystick... anything like this) connected? If you have, disconnect it...
Im afraid that I cant help you much more, I not a Momo wheel guru. Just one thing hit my mind aleready.... are you using Logitech Profiler or no?(can u see the "W" in tray?)