I can't think of any rules specifying a gauge for use with sensors like this. The only place wire gauges are specified is in R48 (2013), which is for wires hooked up to the PDB, not the DSC. Additionally, there is a stipulation stating:
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Wires that are recommended by the device manufacturer or originally attached to legal devices are considered part of the device and by default legal. Such wires are exempt from R48.
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Emphasis mine. So per the 2013 rules, I think you would be fine. Besides, have you seen the tiny wires that come with the KoP encoders from USDigital?
The answer might be different if you needed 12V to power them and had them hooked up to a breaker in the PDB.
And for what it's worth, I've ordered a lot of stuff from newark.com when it hasn't been available at digikey, and never had a problem. It looks like they have some of those connectors in stock, too.