New Mercury free design Precise four channel vacuum indicator designed specifically for intake synchronization of engines with multiple carburetors or throttle bodies For use with any 2,3 or 4 cylinder 4-stroke motorcycles Spill proof design Unaffected by barametric pressure changes Included hook to clip onto the handlebars Convenient storage area for adaptors Includes manometer fluid, hoses, 5mm adapters Optional 6mm adapters are available
