Not sure if this has been mentioned before, but looks like a cool little device. Basically, instead of using an accumulator tank, this uses a pressure transducer to reduce the typical water pump cycling sound and somehow regulate the pressure.
I was a little taken aback by the price, but may be worth it for the reduction in sound and stress on the plumbing system.
Water Pump Controller | IRVWPC (https://www.irvwpc.com/)
https://www.youtube.com/watch?v=TmrjYHa4KCE
WOW, over $200 to do what an inexpensive 2 gallon accumulator does. I must be missing something here. Bet that electronic card does real well in the humid corrossive environments that the pump and accumulator live in.