1989 kawa 650sx kill switch wiring.

Just picked up a 1989 Kawasaki 650sx without a kill switch. Ordered a little guy off Amazon just has a red and black wiring coming off of it. When wiring it to the existing start stop buttons which do I splice into? Believe there's 2 wires going to and from each. Assuming positive and negative. But if anyone can make my life easy I'd appreciate it.
Thanks
Matt
 
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