Can't you just get a wide band sensor and wire that into the ecu and display on serial gauge? I'd definitely run a wide and for sure. Tube can change a but depending weather.

 

^^Mod - is this what you mean below?

AEM 30-2002 Bosch Wideband Sensor Kit



Will this just plug into my AEM v2 and then display on the AEM serial gauge?

EDIT: Learned that the AEM v2 needs an external UEGO controller to run AFR. So, I'm leaning towards the Gauge below as it has the controller and gauge for less than the controller itself, listed here.

The other option is the stand alone AEM 30-4100 UEGO Controller Gauge. This seems to live on its own, not connected to the EMS and just report what it finds via the sensor and shows on gauge.