For synchronous measurement at 2 â 4 carburetors with vacuum connection at the carburetorThe carburetors should be synchronized after adjustment and control of the valve clearancesuniversal useUnit for vacuum measurement: 0-70 cmHg / in0-30 inHgUsually necessary after a large inspectionOptimum results for mechanically perfect motorsMust be used with the engine runningPressure gauges are mounted on platesIn sturdy plastic caseApplications: Multi-cylinder engines require synchronous opening of the throttle valves. Due to tolerances in the intake system, adjustment of the throttle stop is not sufficient. This requires a dynamic setting. The same vacuum is achieved before the carburetors by synchronization. Synchronising requires a dial gauge for each carburetor. Adjustment mechanisms are used to align the individual carburetors.This text is machine translated.