Perkins 1106A-70T Operation And Maintenance Manual page 29

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Features and Controls
Sensors and Electrical Components
Very Low Oil Pressure Warning
The very low oil pressure setpoint is dependent upon
the engine speed.
Failure of the Engine Oil Pressure Switch
The diagnostic lamp warns the user about the status
of the engine oil pressure switch. The engine oil
pressure-related strategies will be disabled in the
event of a failure of the engine oil pressure switch. A
failure of the engine oil pressure switch will not cause
a shutdown of the engine or any horsepower change.