What are the two screws next to the pressure gauge of the car wash pump for?

Control pressure. According to the instructions of the pressure gauge of the car wash pump, there are two screws next to the pressure gauge, one is the adjusting screw next to the pressure gauge, and the other is the adjusting screw on the pressure switch to control the output pressure and start-stop pressure of the pressure tank respectively. Car wash pump is a tool that uses high pressure to spray water.