That would be about 125 ft-lbs., then.
I could see an O2 sensor being somewhat tighter than this, due to heat cycling and exhaust gas chemistry effects.
"highkm" wrote I used a pulley that I use to pull a downed Moose when I go hunting. It has a scale on it. I hooked the end of the wrench, wrapped the rope around the fixed pipe in the garage and turned on the motor that wraps the rope. I stopped when the motor registered about 125lb. It is eactly 1/8 of the pressure at the hook. The wrench is about a foot (that's the radius R). Torque = R x F.