In order to install the Rotary Axis:

• Slide the base into the main dovetail slot of the Fixture Plate and tighten locking screw (choose one side to tighten, and loosen the opposite side).  The rotary axis uses the same locking mechanism as the standard vise explained in 
• Plug the cable into the front connector of the electronics cabinet and tighten connector screws.

The axis is 'A' by default, and can be accessed immediately from the controller. (Start with the "Home A" button)

CAD Models of this setup can be found here: 4Axis Vise and 4Axis ER32 Tailstock 

Note: there was wiring change starting at Machine Number 37. To confirm that the wires are in the proper orientation (make sure that the machine is in the "off" state before doing any work in the electrical cabinet), use a digital multi-meter to check for continuity between the top 2 wires and the bottom 2 wires.  If there is no continuity, then swap the green and blue wires and check again.