You don't have narrowband emulation to the ECU???
Idle will bounce around between rich and lean slowly. The gauge will be sluggish upon startup as the sensor and engine warms up.
Cruising around the AFR will jump back and forth rich/lean sometimes very rapidly.
Under throttle it should be richish...the more throttle/boost the more rich it should be, never above 13 though
It bounces back and forth because the ECU can't read exact AFR with a narrowband, so it reads rich, sends lean fuel, sees lean, sends rich fuel, over and over. Cruising AFR's are not critical. Its called closed-loop mode where it listens to the 02 sensor for feedback