Most of the people on here with 270 degree wheel driving cabs have hacked PC steering wheels as an interface.
I've never used a U-HID nano.
Pots look right, but may or may not be backwards.
If the controls are reversed, just reverse the two outside connections on the pot.
It doesn't take long to do a quick test to see which way is correct.
For the steering, you should only need to hook up the upper pot.
The lower one is for the force feedback drive board.