if you want to continue with the accumulator and a standard type on /off pump and NOT the variable flow pumps then do what I did with the Sqr D pressure Sw.
Look at an air compressor type pressure sw. and adjust to minimum of 25PSI with a 45 or 50 psi shutoff. Air pressure is what i used to set it up/check it. . Just be sure the sw. can be adjusted for that pressure range.. You won't need the relief function but they will start at zero pressure unlike mine.
The one I bought last summer [below] was a well type control so it has a minimum pressure to start the auto function meaning if the pressure drops to less than about 15psi , I then have to go down and overide the safety. That minimum was meant to protect the pump in case the well runs out of water. I have never run out of water although if you think you might then the protection would be a good idea.
I set mine for about 25-45psi
I used both contact sets for + & - lines and added a reverse diode to kill the backflash from the motor to further protect the contacts.
My sw. starts and stop cleanly and the old one gave 20 yr service.