All you are doing is shutting off the fuel when the flow stops or temp is to high start with the power to one side of the flow switch other side of it goes to c on the thermostat then p1 goes to one side of the fuel solenoid in series with eachother
For Briggs / Vanguard
Everbilt Model # EBNCFS Internet # 205618024
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Normally Closed Float Switch $24.98 / each
http://www.homedepot.com/p/Everbilt-Normally-Closed-Float-Switch-EBNCFS/205618024
For Honda
Little Giant Model # 599117 Internet # 205071648 $45.00 / each
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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.