Trying to figure out AFR reading

Ok, that model isn't as prone to ground issues and doesn't need calibration, so there are fewer user errors possible than with some models. And it's easier to have a false lean reading than false rich. So it could be a gauge issue, or it could be the #2 cylinder is lean. Check to be sure the plugs are even - but if you've had issues with two sensors already, the gauge and its wiring are the common factors. If you're using a chassis ground, try relocating the ground wire to the block or battery.