LOL
Assuming your OS sees properly your wheel and GP4 not:
Have you tried configuring it in these different ways :
1) As normal wheel inside GP4
2) As user set ( wheel ) and give it a name
3) As analog joystick inside GP4
4) Configure it in windows control panel-> joystick as analog 2 axis joystick or common wheel but not Trustmaster
Let us know
Boomy
P.S. Mr. Brown italian lesson : correct spelling of italian bad words :
Fanculo,è una merda,non capisce,veramente schifo,and paesà it's a word of southern part of Italy,something like spaghetti,pizza,mandolino...every foreigners knows above all these ....words...heheh