'73 318 V8 oil pressure sensor: Is NOS or reproduction available?

I replaced the oil pressure sensor with one from O'reilly's because the old one was leaking a lot. No leak. This car has a warning light. The photo is the one I took off and I think it is the factory original. Part # NTROL 6083. Is there a source for an accurate new one or a NOS part that looks like the old one? Would a NOS one deteriorate on the shelf after decades?

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