Coil the excess wire for each piece of equipment and secure it with a wire tie. With a permanent marker, pen or pencil, write the name of each piece of equipment (i.e. light #1, #2, actinics, pump, heater, etc.) on a strip of masking tape and wrap the piece of tape around the plug end of each wire. This will eliminate the need to trace each wire back to its source in the future.
Locate a position on the side or back wall of the cabinet for you power strip/timer. Measure the distance between the anchor screw holes in the back of the power strip/timer and mark them on the location position in the cabinet. With a drill and a small bit, or a hammer and a nail, make the screw starter holes for the timer/power strip.
Install the mounting screws, then mount the power strip/timer on the screws. This is usually easier to do without the wires attached to the strip/timer.
Using a suitable length (as short as possible) extension cord (if required), install the power strip/timer and insert the plugs into the timer. You can put the coiled wires behind the cabinet, where they will be out of the way.
Turn the breaker off for the aquarium equipment outlet and install the Ground Fault Circuit Interrupter (GFCI) outlet according the the included instructions. Turn the breaker back on and plug in your timer/power strip/extension cord.
