OTC's Injector Pressure Regulator Controller for Ford 6.0L Diesel Engines plugs directly into the factory Injector Pressure Regulator using an OE compatible connector Allows the user to close the injector pressure regulator in order to determine if proper injector control pressure is achieved and sustained for the starting process Tactile on/off switch with LEDs confirming power to the tool and signal to the injector pressure regulator Permits a quick initial diagnosis of the pressure regulator when a hard start or no start situation exists Must be used in conjunction with any brand scan tool capable of reading fuel pressure on 6.0 liter Ford diesel engines