Chewed-up coupling connector - How-to?

Folks - The oil pressure sensor/tube is secured to the engine block of
my A-65 by a brass connector which is getting pretty chewed up; Over
the years previous owners apparently using something other than the
correct tool to tighten it down.

I'm told (please correct me if my understanding is incorrect) one has
to replace the sensor and gauge in order to replace that connector.

Any suggestions on how to improve the lifespan of that brass
connector? - Mike