Parking break wire bypass?

I recently bought a Pioneer AVH-x2600bt stereo head unit. I have it all wired up and the parking break wire is the only thing that is left. I'm not quite sure how the best way to go about it is. I'm installing in in a 2004 Ford Escape without premium sound if that helps at all.

Wire it to a 12v "ignition" if you want to be able to watch while driving, wire it to the wire that turns on the "BRAKE" light in your gage cluster if you want to do it "right"