Autozone’s free online repair info will probably give you the fuel pressure specs & test procedure.
As for the new pump - I don’t trust any part just b/c its new or rebuilt. Parts are commonly bad right off the shelf. I actually don’t expect the fuel pressure to be an issue. Its just that its a simple thing to check and needs to be eliminated as the problem before moving on & driving oneself crazy with other things.
As for the other things, I don’t know the injector set up on this engine - plenty of people here probably do & can say better than I if correct fuel pressure is verified.
You can buy a fuel pressure gauge for all of about $40. You might also find them among the loaner tools at an auto parts store.