radar detector

I am wanting to hard wire my Valentine One. There is power at the map light, but it stays on all the time. Does anyone know of where or how to get power by the rearview mirror that switches off with the ignition. Thanks in advance for your help. Danno

Trading in the MS3, and want to take as much back to stock as I can. If someone out there is using an Escort 8500 (or similar) radar detector, this may be for you. I want to trade straight up my center console for yours, no money exchange (just pay for your side of the shipping). I will...