Emergency kill switch

If you auto cross- use the horn button as your disconnect. Install a relay - 85 is power 86 is wire from negative horn button (delete factory horn relay) 87a and 56 are your circuit to coil and fuel pump. Need to kill car- hit the horn. OR get a Latching relay. You hit the horn and it opens the contacts for the power until you hit the button again. No extra switches and looks factory.