WARNING: This page is about a different car, the 2014 RAM 3500 HD and 2014 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: CNG Pressure Regulator
Courtesy of CHRYSLER GROUP, LLC
Install the tank sensor (3) onto the pressure regulator (4).
Connect the electrical connector.
Pressurize the CNG system.
Check for leaks using an air leak detection fluid.