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Features and Benefits: The special 2-1/4" gauge has two multi-colored bands - idle and 2500 RPM with pressures shown in PSI and bar All included in a plastic blow molded case Includes a hose 6 ft. which is enough length for the technician to test from the drivers seatEnables technician to test exhaust back pressure through oxygen sensor adapter includes M12 and M18 thread. The special 2-1/4" gauge has two multi-colored bands for idle and 2500 RPM with pressures shown in PSI and bar. The gauge is furnished with a rubber boot to protect it. Works great for any technician.