get a autometer guage for around town diagnostics. narrow band 02's with this gauge are perfectly fine for monitoring a/f's.

dont let anyone tell you that you need a wideband all the time. only when you sway away from 14.7:1 do you need a wideband. and 14.7:1 is where you should be at for almost all engine running conditions from idle to about 5psi boost (on a low compression high boost setup like a EVO)