Pressure Gauge
WARNING: This page is about a different car, the 1987 Chrysler Conquest. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect pressure sensor wiring connector from inside of engine compartment. Install a 3.4-watt bulb between harness side connector (pin No. 6) and ground. Turn ignition switch to "ON" position. Ensure that test light illuminates and that pressure meter segments light on the positive side.