If your NPT thread is leaking, I believe it is 1/8" NPT pipe. A typical tap and die set has this tap in the set. Thread it in and turn maybe 1/8 turn and then see if it seals. EZ turn is a lubricant not a sealant, so go back to #2 permatex or #3 which ever you have on hand. Sometimes a rapid production threading for NPT leaves an axial ridge line where the tap stops and that is where the leak initiates. Especially if it is a single point threading tool. Just honking on it with lubricant might work but it also might break the housing. It IS tapered! So . . . not recommended.
“I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.”