Motion Pro - Syncpro Precise 4-channel vacuum indicator designed specifically for intake synchronization of engines with multiple carburetors or throttle bodies. The SyncPro is not complex, but it is a precision instrument that requires proper set up and operation to function properly. The SyncPro comes with four pages of very detailed, necessary instructions and it is vital that a new user become familiar with them before using this tool. Features: Precise four channel vacuum indicator designed specifically for intake synchronization of engines with multiple carburetors or throttle bodies (maximum vacuum rating for this tool is 40cm Hg) Mercury-free design For use with any 2, 3 or 4 cylinder four stroke motorcycles Spill proof design allows tool to be stored in a horizontal or vertical position Easy to read scale for precise synchronization Unaffected by ambient pressure changes Includes hang hook to clip onto the handlebars for easy use Rugged, impact resistant ABS enclosure with convenient storage area for adapters Rubber feet on enclosure bottom helps prevent sliding Includes hoses, 5mm adapters, in-line restrictors and instructions 5mm adapters are used on many Honda and Suzuki models Optional 6mm adapters are available for use on most Yamaha models Most Kawasaki models do not need adapters Patented design