Protect your vehicle from theft with this simple, easy to install kill switch. The DUI Kill Switch is designed to disable the ignition by grounding out the coil which will prevent the engine from starting. The system is easy to install with the included hardware. Just mount the toggle switch in an inconspicuous area, connect one side of the switch to the negative side of the coil and the other side to a ground. This effective and low cost anti-theft device will ensure that your hot rod will remain where you park it without the fear of some knucklehead driving off with it. The kill switch works with all DUI and HEI style distributors. Comes with all items pictured and easy to follow instructions.