Universal Manometer Fuel Injection Pressure Tester Gauge Kit System 0-100 psi The uniquely designed 3-1/2" gauge has a special expanded 1lb. increment dual dial for accurate reading, with a 100 PSI /10 bar scale. It also has a relief valve and 6 ft. of tubing to relieve the pressure and fuel safely. Also allows checking for sufficient fuel flow. Gauge has hook, allowing technician to have both hands free The included adapters, hoses and fittings cover all fuel injection systems and most cars and trucks world wide! A time saving quick coupler connection at the end of he gauge hose makes a speedy and efficient couple possible with most adapters.