Thanks again for this DIY kfiducia. I did it this morning, took me about an hour (mostly running in and out of the house for tools and drinking coffee).
I agree w/ not making any permanent mods to the electrical system, which is why I chose this installation method.
I would add to this instruction set that you need to add 2 fuses to your "add-a-fuse" to complete your circuit (as you pictured), even if you are using an in-line fuse (a la Escort hardwire kit).
Also prepare to dislocate your elbow to get to the fuse panel, which is about 6 feet behind the glovebox. WTF?
Monaco Blue/Savannah Beige 135i