Converting from a Key Switch to a Push Button Switch and Toggle Switch. Just wanted to share this. I have converted Vanguard 16hp and Honda 18hp and 20hp from Key Switch to a Push Button Switch and Toggle Switch. Here is how I did it.
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I use Regular Float switches, Normally closed for the Vanguard. One wire to Ground and the other to the Kill wire located on the right hand side of the engine near the top. For a Honda I use a Normally Open float and hook it between the yellow wire and the Black and Yellow wire so it cuts off the fuel when the float is down.
The Toggle cuts off the engine voltage and grounds the coil and cuts off voltage at the same time and will not allow the power to be on unless you flip it up again.