Align the holes of the strap with the holes of the cover.
Use two screws to mount the switch onto the cover.
For the 3-Way switch, see figure below for wiring details.
CAUTION:
Use 12 AWG copper conductors only. Insert the bare wire conductor(s) under the
terminal clamp and securely tighten the screw(s). Note: Do not exceed 35 in-lbs. of torque.