you can make anything work as a kill switch. Alot of people with tinted windows don't use their rear defrost so you could use that. Before my bf was trying to sell his car he mounted a center speaker on the dash for surround sound and used the power button from the speaker. I need one so bad, I got push button start and someone stole my pocket book with my keys so I can't lock my car. I need one don't u think? Anyways..if you want something fancy look on ebay. If not any switch would work...I got all my switches (momo steering wheel - cruise = sucks) from Radio Shack and on ebay. I have them for ignition switches and cruise. But to quit babbling...there are endless ideas.