[Halon]

OK I stumbled upon this picture. Basically, you can see where they threaded in the pressure gauge sending unit. Mine is plugged there, looks like that port was plugged from the factory. You can also see where there is some little goldish colored piece screwed in on that housing. On the used housing I picked up, they didn't have that hole plugged. I checked, and the sender does thread into there just fine. Would that port work?