I would like to use a two-point output pressure switch to achieve high pressure stop pump,

I would like to use a two-point output pressure switch to achieve high pressure stop pump, low pressure pump, I would like to ask how the line should be connected, the best wiring diagram, thank you.

This is very simple. Low pressure when the node connected, then you through the middle of the relay often open the point to lock the node,

to a high point, through the other relay off the pump on the line The

so that even if the pressure will not stop the high point of the pump;