Synchronize 4 carburetors or fuel injection thottle valves with a CarbMate or SynchroMate. A standard procedure is followed to synchronize 4 cylinders. Bracket kit includes interconnection and additional 2 tubes that match existing instrument tubes). CarMate requires a TS223 (black) or TS224 (red) holster to attach the bracket to the instrument. May require additional manifold adapters for some vehicles.