23 TRD Pro

I looked at my fuse box...I haven't looked at fuse box in 20 years!I would not even begin to know what is on with ignition or not or, even how to tap into it.
I was hoping to find an "accessory" supply that was fused...nope.
Do I stuff the add-a-fuse connector into what I assume is a blank spot like beneath "TOWING TAIL" or "EFI NO. 2?"

 

If you use the "add a fuse" it shouldn't add the current to the existing circuit. "shouldn't" because you have to plug it in the right way, use a multimeter with the fuse removed to figure out which is the powered side of the fuse slot. You want the whip end of the "add a fuse" on the unpowered side.