Step 2: Wired (third-party) 360 controller
After installing Tattiebogle like described in the last step for the wireless controller, download this link and run the command script to update Tattiebogle. This comes from Shoryuken forum member EddDeDuck. The forum post I found this is here.
(Note: found out the link for the command script is now broken. File attached to this step)
You will also need the Joystick Mapper app from the App Store to make this work.
OK, that's it. Have fun.