I have wired up the CR 750 lookalike to day, i'm using a boyer total loss system, kicked it over and have a spark, i now want to fit a kill switch, but the only one i have, is open, like a horn button, i want one that is closed, so when i press it, it isolates the power to the coils, i have checked on ebay and they all seem to be the same. are the ones that have, on,off buttons,the one i need, i would prefer a one button type if possible, something that is normally closed, untill you press it.