Sean Roe told me the black wire on the O2 sensor.
I found it easier to tap at the wire harness connector at the PCM. I tapped both lf/rt then I wired them to an A/B switch selector so I can check AFR at either side.
You might want to rethink what your direction. The O2 sensors on the viper are not wideband (wb). The oem sensors are not accurate except at or near 14.7. You are far better off installing a wideband system, otherwise they are only eye candy and cannot be used for tuning.
Shelby I agree with the others, a wideband A/F monitor is a must with the mods your running. Feed the signal into the VEC2 and get some valuable data to optimize you setup.Where is the best location to pick up the signal input to an AFR gauge? Thanks