●Enables technician to test exhaust back pressure through oxygen sensor. ●Oxygen sensor adapter includes M12 and M1 thread. ●The spcial 2-1/4 in. gauge has two multi-colored bands-idle 2500rpm, with pressure shown in psi and bar. ●Fumished with rubber boot to protect gauge. ●Hose is 6 ft., enough length for the techinician to test from the driver's seat.
