fuel pressure testing connection

There is no port you will need to disconnect the fuel line at the rail and install a tee from the fuel gauge set.

Here is a guide to help you see what you need to do.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

400 kpa ±34 kpa (58 psi ±5 psi )

Here are some diagrams to show you where to tap in too. (below)

Please let us know what happens.

Cheers, Ken

Where do you take a fuel pressure reading on a 2006 Chrysler pacifica with the 3.5? I'm unable to locate a tap on the fuel injection rails. What should the fuel pressure reading be?

You need a special test kit to check fuel pressure this needs to be connected between the engine fuel rail and the frame, Then start the engine the pressure should be 55-65 pounds

Let us know how it goes, we are here to help

These engines do not have a service port on either the fuel rail or the incoming line. The fuel gauge kits usually have adapters to hook right into the line to test.
Here is the spec FUEL SYSTEM PRESSURE - 400 kpa ±34 kpa (58 psi ±5 psi )