[AndrewCologne]

Where is that AFR gauge connected to, the narrowband 0-1v signal?
I guess not as with a narrowband signal it can't read steady AFR 16:1.
So are you using a wideband controller? and if yes, ... what resulting voltage of the controller equals Lambda 1 / AFR 14.7:1

1. If you're using the stock eco, ... use the orig narrowband sensor and read the voltage of the green wire on port 2 of the ECU, ... does it swing between 0.1-0.9v?
If yes then you're spot on Lambda 1

2. Is your exhaust system stock as it left the factory? Cause removed Cat or SSIs do affect the resulting sensor signal.

3. I would not focus on AFR, but on lambda as that is the native reading of the sensor. AFR is just "calculated" from the sensors lambda reading and also depends on the ethanol content. Be aware that with 5% ethanol at lambda 1 the AFR equals to 14.4:1.