According to Nason's specs anything labeled 2B would be 1/8" NPT and SPST-NC. That would be 2 terminals. 2C would be the same size but with 3 terminals. I'm sure it could be made to work but why go through the trouble. See attached literature to decipher Nason part number.My 831a has a Nason 1M-2B-15F/67 pressure switch with two terminals. The photos for both the 14 and 15psi switches described here look like there are 3 terminals. Have you received your order yet? How many terminals are there?
Also, are you sure you have a 1M? I see no mention of this from Nason. They make a LM switch that is virtually identical to the SM line but no 1M.
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