Well with regards to the switch, leave it wired to the on position and install a separate switch to turn it on and off. That way no matter what, the pump will turn off when you turn off the engine. You probably don't want the pump running while the engine is off and it would suck if you forgot to hit the switch to off and walked away while the pump is draining your battery.
I am sure someone will chime in if I am wrong, but the fact that the engine has a bowl and float system means that the fuel pump is merely keeping the bowl full of fuel, it should not matter how it gets there.
Lastly, congratulations on your new rig. Welcome to the sport of going places you didn't think were possible. The first time you pull it in to a lake is a feeling you will never forget.
Borrowing tools is for the weak.
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2000 Max IV, 25hp Kohler Command, 26" Titan Tru Power AT's
1996 Max IV, 18hp Briggs, 24" Serwas
1998 Max IV (project in waiting)
1995/1999 Max II, 16hp Briggs, 21" Rawhides
Hustler 950 (Project in waiting)