8MILELAKE Engine Cylinder Oil Pressure Diagnostic Tester Tool Set Tests oil pump pressure and also low oil warning devices. Fitted with quick coupling adaptors and 1200mm of hose. Includes 90 degree coupling adaptor for limited access applications. Gauge fitted with heavy-duty cover. Choose a suitable connection point for the oil pressure gauge cuz some engines has a blanking plug on the main engine oil gallery. Remove oil pressure switch in most cases. Select the suitable adapter to the engine. Connect the hose quick connector directly to the adapter or by the 90 angle connector. Start / crank the engine. Bleed  air from the pressure hose by the bleed valve with thumb. Tips: A cloth available to soak up the small amount of oil that may spill from the bleed valve while bleeding the hose. Release the bleed valve and the live oil pressure reading should be seen on the gauge while the engine is being cranked or run.