I bought the glovebox flashlight adapter from the dealer for $15. Plugged the cig adapter into that and tucked the one wire up the A pillar with a spoon (didn't remove it) and the other wire to the consealed display in the ash tray.
You just have to remember to turn the power off of the unit when you exit the vehicle. I use my radar detector about 20% of the time I drive so not much of an issue for me. Hearing all those beeps on the street when there is no way for me to speed is annoying.