I've heard that unless you get a wideband O2 sensor and the gauge to go along w/ it, that an a/f gauge is worthless. But I remember seeing LoneLuder in another thread recommend someone getting one; are they any good for checkin if you're runnin lean? If not, why is the stock O2 sensor not good enough?

 

a cheap a/f guage is OK for basic monitoring, if you are hardcore (loke some of us crazy bastards) you will install a wideband O2 and digital display to properly monitor ACCURATE a/f ratio