Sensor, Fuel Pressure: Description
WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The CNG utilizes two separate fuel pressure sensor. The high pressure sensor or cylinder tank pressure sensor is located on the top left side of the fuel pressure regulator.
The low side pressure sensor is part of the fuel rail sensor that is located on the CNG fuel rail.