WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Locating Line Pressure Test Port
Courtesy of NISSAN MOTOR CO., U.S.A.
Location of line pressure test ports are shown in the illustration.
Always replace pressure plugs as they are self-sealing bolts.