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- 2007 Mazdaspeed 6 GT Retired: 2002 Protege 5
I have a prosport AFR gauge but it's a narrow band not a wideband gauge and i'm wondering which wire to splice into the stock o2 sensor? Also i'm wondering if a narrow band afr gauge will work because i've read a few times that the speed 6 comes with stock wideband o2 sensors