This is what I use. Works like a charm, but you need to get the correct ball valve that will stop when the tank is full and also allow enough flow for the pump.
Normally the pump has an water exit and this controller fits perfectly into that slot and you use it’s exit as the exit. Then it is just wireing the power and you are off.
I can recommend the Eduan float valve Installing water tank - #9 by Louisvdw