Leaking 727 Transmission Neutral Safety Switch

Seems to be a common problem. I had a Neon that did the same thing, oil pressure sending unit though.

You might consider obtaining the original P/N and looking for NOS. (2932820 for 1969, same P/N for 904 and 727) Chrysler most likely used the same part for many years so there's gotta be some out there.
It may or may not work but you can't keep doing the same thing.