I thought I would share my gear shifter mounted kill/start switch. The switch is for a winch and I set it up to kill the engine.
Push down to kill the engine
Push up to start the engine
EDIT: LINKS ********************
Here is a similar model:
http://www.promarkoffroad.com/winch-...t-winches.html
Here is the exact model:
https://amzn.to/2RFdSif
Here's a momentary rocker switch from Granger that would work:
http://www.grainger.com/Grainger/POW...ND6?Pid=search