Bosch's FIX 7803 Vacuum and Fuel Pressure Tester Kit is a great way to fine tune carburetion and timing for peak performance and maximum fuel economy. Use to test fuel pump pressure, mechanical condition of the engine, vacuum control system function, and much more. This versatile tool finds intake manifold leaks, blown manifold and head gaskets, worn piston rings, burned valves, and leaking vacuum lines on conventional and computer-controlled vehicles. The easy-to-read, 3-1/2 inch diameter gauge face displays 0-30 inches vacuum (0-70cm) and 0-10 pounds (0-70 kPs) of pressure in both standard and metric scales. Includes gauge, hose, multiple adapters, and detailed usage and testing instructions. NOTE: fuel system functions are for carbureted engines only - not for use on fuel injected vehicles! 1 year warranty.