Awakingdemi Fuel Injection Pump Pressure Tester Injector Test Pressure Gauge Set w/Case The test gasoline fuel pump pressure's range is 1-100PSI, 1-7BAR. Allow the mechanic to adjust it to the correct pressure if it is adjustable. Used to test if the fuel pressure regulator needs adjusting or replacing and more: for example test fuel pumps,injector leakdown,pressure regulators and test for bad filter as well. Applications: American Motors; Bosch AFC, MPC European & Japanese (except CIS); Chrysler Corp.; Ford Motor Co.; GM (except TBI); Japanese fuel injection systems. Help you to to see if you had any leaking injectors, within a few minuets of hooking up this gage to the automobile you could see if injectors is leaking at a static with engine off.