747 crossfire conversion question.

[WEG1192 at aol.com]

<<Hi all,
     What exactly is an O2 sensor and how does it work???>>

Is this necessary? I mean, granted I've asked some seemingly dumb questions, 
but after getting confusing earfuls from TPIS, Turbocity, FIS, etc. this is 
the only place where commercial motives don't dictate the answers.

Oh and if this comment wasn't meant for myself or David Posea, never mind.
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