You would have one wire from the auto side of the switch going to the float switch and one wire from the manual side of the switch going straight to the pump. This way you can select to run in auto, when the water level comes up the pump comes on automaticlly or you can choose to run the pump when ever you want in manual. Also if your float stop working you can flip it to manual and run that way.
If you rely on the float alone and it takes a dump then you can't run the pump. 3 Wires 1) from auto to float then to pump, 2) from manual to pump 3) ground wire.
Some auto/manual switches are set up to be momentary in the manual position which means you have to hold the switch when using manual. I like mine to be maintain, I flip it into manual and it stays till I turn it off.
Hope this helps.
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