Pressure switches usually have two or four connections. All they are are the in and out terminals for the switch or switches that the pressure sensor activates. They are usually labeled to keep them separated between in and out but it doesn't make much difference to the motor.
The multipurpose pressure switch may have a common (C), normally open (NO) and a normally closed (NC) terminal, three screws to put wire on. If this is what yours has and you have a 120VAC system, you need to attach the "hot" wire to the common terminal and one lead from the motor to whichever other terminal has continuity to the C terminal when the pressure is low, if you don't have a meter, just hook it up and if it doesn't work right move the lead to the motor to the other one. Nothing will be connected to the other terminal. The Neutral power wire will go directly to the motor.
If you switch has four terminals (two switches inside) you can attach both the neutral and the hot to one set of terminals normally labeled L1 and L2. These terminals NEVER connect to each other through the switch, they always connect to the output terminals, normally labeled T1 and T2 or any other designations desired.
If you have a 220VAC motor, you still only have two leads to the motor and they connect the same way with a two switch, four terminal set up. You would connect the two hots to L1 and L2 and the two motor leads to T1 and T2 (if so labeled).
If this doesn't help, add a comment and I'll try to explain it some more.
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