Carburetor Synchronizer: Makes synchronizing your carburetor setup quick and easy. Suitable for 2, 3 or 4 cylinder engines. Complete kit with vacuum gauge, hose, extension rod. Motorcycle Fuel Vacuum Gauge Synchronizer: High quality and durable, makes synchronizing your carburetor setup quick and easy, easily achieve motorcycle carburetor synchronization and balance. Each gauge hasits own damping control and calibration control. Treat yourself to a tester with 4 vacuum watches for synchronization. Convenence: Synchronizer helps you to synchronize the values of up to 4 carburettors as well as adjust and adjust them. Features: This kit allows you to synchronize the values of 4 carburetors, as well as adjust or adjust them. Tests mechanical and electrical fuel pumps and checks for worn or defective parts in the fuel pumpand vacuum system. Package includes: 1 X Vacuum Synchronizer Gauge 2 X Vacuum Hoses 4 X Connectors 4 X Carbon Extension Rods.