Fine tunes carburetion and timing peak for maximum fuel economy. Easy-to-read, 3-1/2" diameter face displays 0-30 inches vacuum and 0-10 pounds of pressure. Complete with hose and adapters.

Use to check: Fuel pump pressure; Mechanical condition of the engine; Vacuum control system function; For leaks in the intake manifold, manifold and head gaskets, piston rings, valves and vacuum lines