Connect the power wires and the pump wires as directed. Most pressure switches have a small diagram on the inside of the cover. Some switches have the contacts labeled as L1&L2 for the power lines and T1&T2 for the pump wires.

All that is left now is to reapply the cover and to open the gate valve of the water line to the dwelling. Flip fuse(s) back on and the pressure switch should kick in.