Accurate, affordable and ultra-easy to use, CarbMate is perfect for twin carb or injection V-Twins with adjustable settings. CarbMate displays the difference in vacuum intake settings of two linked carburetors very precisely on a single transverse horizontal nine-LED display. Visual estimation errors that are common to the traditional approach, which is to visually compare the individual values on separate columns of mercury or dial gauges, are eliminated, as two pressures are compared and one value is displayed. A “Zero” adjustment knob provides easy and quick pre-calibration prior to synchronizing.