I worry about the calibration of the wideband O2 sensors, especially the 2 cheap setups I got. I welded in two O2 bungs in my Dart so I can also use a simple narrow-band sensor with lean/rich indicator. I will use that to verify/adjust the calibration of the wideband signal. A narrow-band sensor acts as a simple digital switch, so should be very accurate where it switches. I also got a cheap A/D box so I can log both on my laptop as I drive to analyze later. All my effort would be a waste if I crash from looking at gages when I should be watching the road. All just dreaming for now. I need to finish painting and re-install my interior first.
