Two controllers setup
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Tight!
I see that your power plug makes a 90-degree turn as it comes out of the unit. Did it come that way when you bought it? Mine is a straight plug that sticks straight out and barely fits in my outdoor cover box.
I reused a pre-existing cord from the old irrigation controller. I believe you can purchase a “wall hugger” style outdoor or heavy duty extension cord and cut to length.
A good trick the previous installer did was to coil the sprinkler wires instead of cutting them to length. This gives you a lot of length to work with in the future without taking up too much space. I strengthened them out during replacement and coiled them around a thick screwdriver for the final install. It’s coiled in both installs but you can see them clearly in the second picture.
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Nice, clean install. I’d suggest adding some caulk where the sprinkler wires are entering the wall. You don’t want water or creatures getting in there. 
Good idea. Thanks.