How do I mount the Orbit 27894 timer on my wall?

Use the included mounting template to mark the screw locations on the wall. Install a No. 8 screw in the upper location, leaving the head protruding 1/8 inch from the wall. Slip the timer over this protruding screw using the keyhole slot on the back, then drive another No. 8 screw through one of the pre-formed holes in the lower back cabinet (Page 5).