LLigetfa
DIYer, not in the trades
The port is close enough to the edge that part of the threaded nipple may be visible in a portion of it but it needs to be opened up as much as possible.
Worst case, you put a plug in that port and share the port the pressure gauge is using by adding a Tee.
Worst case, you put a plug in that port and share the port the pressure gauge is using by adding a Tee.