what type of connection is the other end? barrel plug? usb-c? mini usb? micro usb?
usb is 5v, so a 12v to 5v adapter can be found by the millions, all you have to do is hook it up to accessory power and feed the wire up.
you can make it a nice clean, no drill, no nothing install. mini fuse adapter to the needed input adapter, for $20 you can make it no hassle, no marks, fully reversible.
I can't understand the desire to drill a hole there............
