I didn't say so first time round, but having installed the AP1 I wouldn't use one again. It's very pretty and you get a lot of small bits which cost next to nothing. There may not be a 60 Amp fuse and holder so check. I seem to remember their blurb saying fit a fuse which they so easily could have built in to the AP1, just for safety reasons.
The first big issue I have is I often have the seat off for doing jobs. If there's a rain shower, water will pee into the AP1 everywhere. I got an A4 sheet of Mylar film, the sort used for overhead tranparencies, and fastened it so it wrapped over the AP1 under the seat. To get the seat clearance in the low position I also had to file down their fixing spacers to lose some height. I've never been over keen on screw terminals either, with vibration they have a habit of working lose.
If I did it again, I'd use 6 of those rubber moulded blade fuse holders that come pre-wired. I'd mount 3 alongside each seat rail so there wouldn't be a space issue and the whole lot would be proper automotive splash proof. Then I'd splice and crimp the ends together to the Maxi Blade fuse I had to buy anyway. The grounds can be spliced with crimps.
From memory, I didn't fit a power relay to the whole block, since I wanted some of my outlets available with the ignition off, some HID lighting circuits did come through a power relay which were controlled by my Autoswitch.
As others have said, the most popular choice is the parking circuit and you can pick that wire up from the rear tail light.
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