Don't worry about asking questions, I've made a career of doing it, lol.
The electric starter is independent of the kill switches - except that you have to open the switches for the engine to run...
My engine started out without the electric starter, I shopped the motor from
db electric, iirc it was $30 or so, then used a standard (inexpensive) starter relay and some wiring.
I really like the throttle / governor setup on this engine - it can be a fixed or remote throttle, has adjustable governor, and it's simple and reliable.
Throttle cable connects to an existing spot on the arm, as shown. I had to rob the cable clamp and screw off of a junked mower, and add the return spring, then loosened that friction-lock wingnut and it's ready for a remote kart throttle.
Up and to the left of the end of the throttle cable, just above the governor spring you can see the yellowish nylon part of the old throttle-controlled kill switch. That's where I unhooked and tied my remote kill switch in from.
I've currently got the governor spring in the #2 hole, which is the low end of the "Max RPM" settings and yield a max of 3100 rpm (by tach). With the current gears and tires, that calculates to just over 20mph, which believe me is plenty fast for the kids (and for me!) on gravel/dirt - especially with the gobs of torque these engines make. If I recall, my Briggs manual indicates that if I'd move the spring to the other end of the governor I'd get around 4400rpm, and supposedly I can bypass the governor and get up around 5000, but seriously I can't see doing that in the near future.