Where is the low pressure cut off switch located on a Jeep grand wagoneer?

There isn't a single, universally located "low pressure cut-off switch" in the sense of a readily accessible button or switch you'd find on, say, a fuel system. The Grand Wagoneer's fuel system and other pressure-sensitive systems rely on various sensors and safety mechanisms that *automatically* shut things down if low pressure is detected. These aren't switches you'd manually engage.

To find the source of a potential low-pressure issue, you'd need to consult a repair manual specific to your Grand Wagoneer's year and engine. The location and type of sensors (fuel pressure sensor, oil pressure sensor, etc.) will vary depending on the model year. A mechanic familiar with Grand Wagoneers would be able to diagnose and repair any low-pressure problems much more effectively.