Civic EG

Hey I was wondering how it could be possible to use a momentary switch for my kill switch,I know using a toggle switch would be easier but I dont want there to be one time that i might forget to shut it off. I'm asking this because i had a integra before with one installed that if you didnt push it after cranking it would die out\assuming its some sort of fuel cut off.I was wondering if just using a realy or something would make this possible.