12 volt switched power?

[badbiach]

Ok ok ok. Don't beat me up here. I need an opinion on the best power source for a switched key on 12V power source on these cars. :shrug:

 

[Fun4me]

Passenger side fuse box, I used the heated seat fuse w/ a add-a-fuse.

 

[Tispho]

http://www.svtperformance.com/forums/2011-2014-mustangs-354/877600-12v-switched-wire.html