I've been looking for a cheap wideband, accurate 02 sensor and metering system for my car after I get my electronics figured out. I see that AEM is making a single and dual band (maybe they called it something else), with a gauge for 350 for the single, 540 for the dual. What else is needed and what is the difference? It comes with a nice LCD readout and AEM is a good product from what I hear, Im just curios if anyone has had any interaction with it.