Electrical Tap for accessories

[OldGold]

I'm trying to tap into the electrical system to add a dash GPS on my 2008 Explorer XLT. I'd like to use an accessory power supply rather than a hot wire. Where and how can I tap into such a wire for 'accessory' power? I want the GPS to go off when I remove the key. Thanks, Dave

 

[Tech By Trade]

I ran mine to the acc line on the stereo (yes it is still there) Its a 20 amp. I ran a 3 way power plug box and run my dash cam and my radar detector off of it.