The Powerometer carburetor synchonizer precisely measures the vacuum on individual intake throats to aid in balancing multiple carburetors or fuel injection stacks. Adjustable sensitivity allows use with low-vacuum carburetors such as on motorcycle engines. Pick-up adapters are included for a wide variety of air horns, throttle bodies, and manifold fittings. The compact design allows use in the tightest engine compartments. Complete instructions included.