Reading it is kind of weird. At least for mine:
pX_wheel (X is 1 to 4, as Alan said)
Code:
Neutral : 47
Left : 97
Left Down : 163
Down : 149
Right Down: 212
Right : 201
Right Up : 253
Up : 253
Left Up : 253
So unless you reeeaally want the bottom left and right... You can subtract 60, divide by 50, and cut off the decimal. That'll make neutral 0, left 1, down 2, right 3 , and up 4.
Those were for the one sitting next to me, I have no idea of they stay constant between joysticks. But subtracting 60 should be enough to get it all. =)