Question About Fuel Injector Rail Pressure Test Schrader Valve Fitting

[S50Sinner]

What fitting do I need in order to connect a manometer to the fuel rail? I bought one to measure vacuum and fuel pressure, but it only came with a small handful of male adapters, no female and certainly nothing to actuate the stem in the fuel rail's Schrader valve in order to measure pressure properly. Does anyone know what the proper fitting is? I imagine it's some sort of specialty NPT with a pin in the middle, but I don't know how to even start searching.

It's bigger than a fitting for a tire valve, so I know it's not the same. Does anyone know the size?

Thanks for any help, I used the search function as far as I could, but couldn't find the answer to that question. And if anyone has thoughts on where I can plug into the intake plenum for a simple vacuum test (as opposed to a crankcase test), that would be really helpful as well.