i have a aem ams so i have a gauge in the car i guess from that says air fuel ratio from aem. I had a boost gauge and a/f gauge that pretty much says lean and rich on it and cann i still use this gauge or no because of the aem one?

 

Is your question "Can I have 2 a/f gauges?" If so the answer is yes, but there's no reason for it. The a/f gauge that pretty much says lean and rich is probably a narrowband and is good for nothing but a light show.

 

I have no idea what you are trying to say...it sounds like your air/fuel gauge is narrowband like bryan said though