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Low Pressure Switch on RO Unit

Hey guys, can someone help me with wiring a new Low Pressure Switch on my oooollllldddd RO Unit? There are no wiring diagrams for this old Pro Water Systems RO Unit that I can find. I know this is pretty simple but whoever 'dealt' with this machine before me cut one of the wires connected to the old switch so I'm reluctant to guess on how it was wired.

There are 4 connections on the LP switch, two indicate "MOTOR" and two indicate "LINE" -- this is a Square D switch I got from Kleen-Rite.

I'm attaching photos that will hopefully help show what i've got here.

In the photo the Black Wire which appears to connect to a relay inside the cabinet is connected to the switch and has a second wire which was cut (guessing maybe it was cut when pressure switch failed??) .... appears maybe black wire may have been connected to the 4th terminal on the switch?!?

low_pressure_zpsea8b6304.jpg


low_pressure2_zps0aa760dc.jpg
 
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