question about my A/f Gauge

[BadazzSr20]

hey all,

i have my aem A/f gauge that came out my other car and i just installed it in the 240sx with a sr20det motor. all i installed was the o2 sencer and hooked up my power and ground wire. well it all seems to be working but im not sure about the numbers its reading. the car is pretty much stock all it had done is FMIC, 255Fp, Exhaust. the numbers its reading under boost is 13.3 and 13.2 thats with the boost gauge spiking to 10 and settleing at 5psi as i kept boosting i seen it drop more i seen 12.9 12.8 and 12.7 at idle the car is 14-17 the whole time. do these numbers sound right to you all.

thanks.