Rear View Safety Backup Camera System Questions

I used one of these Fuse Tap to tap into my fuse panel for my Rear View Safety system. If I remember correctly, it only needed about 2 amps, so you can use almost any fuse to get power. I wanted to be able to turn mine on without running the truck, so I selected one that is always powered. I also set mine up so it is not controlled by the reverse switch. I use mine as a rear view mirror since without it I can't see anyone directly behind me when they are close.