I pulled the water sensor out and it is definitely 1/8". Since other people had said they thought it was british thread, and british and npt are so close they will thread together, but not seal, I'm going to guess it is bsp thread. Once I figure out what gauge package I go with, I'll get an adapter to convert the bsp to npt threads and let everyone know how it goes. Hopefully it will avoid having to retap the threads.
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