box stock project kill switch question

#1
Working on a father/son project. Used kart has a box stock project motor and we are replacing the kill switch. I ordered a new one from BSP but the lead are different than the one that we took off the motor. The old one has two leads - one to connect to the coil, the other to ground. The new one, however, only has one lead coming out of the switch. Does anyone know how this is supposed to be connected? Thanks!!
 

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#2
I think the switch is the ground Itself...just connect the wire on the switch to the wire coming off the top of the engine ( Wire coming off coil )
 
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