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The rules are clearly explained in the RULES.
Read them all and ask in the website help forum if you still have trouble understanding something in particular.
Most likely, three terminal allows the choice of normally open and normally closed contacts.
Two terminal will not. It will be one or the other(as specified).
Here's a thread on the same issue on the mep-003/002 gensets and their solution.
https://www.steelsoldiers.com/showthread.php?64455-MEP-002A-and-MEP-003A-Replacement-Oil-Pressure-Switch
I simply googled, "SM-2B-014F"
And got this, http://www.partdeal.com/nason-low-pressure-switch-15-psi-spdt-with-1-8-in-27-npt-male-media-connection-sm-2c-15f.html
I noticed several other sources too.
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