Eastern Beaver w/light c/o switch?

Right on" the one you show without the fuse is the one I have, also if I get an additional fuse holder, I would need to put power to it, so where do I get the power source from? Can't I tap into a 12 volt supply from the oem fuse box?
 
I have the kit that does not have the in line fuse, my pos/neg lines go to a fuse box also I have the on/off switch, can I tie into a 12 volt line from the fuse box.
I still would be putting an in line fuse on it and connecting direactly to the battery