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Precision Carb Sync Gauges Dual Carb Sync Gauge Set with Built in Adjustable Pulse Dampers Mounted on Bracket and with Hoses. Precision Diaphragm type gauge set originally designed for Professional Motorcycle shop use in Japan. Note: Sync gauges hoses hook up to carb holder vacuum air barbs (not included). Your bike must have these air barbs in order to use this sync tool. Part #35-1388 $49.95/Set