On Feb 11, 2013, at 11:45 AM, Ed Anderson wrote:

> Excellent point, Bill
>
> Getting slower in my years, yes, Your suggestion could be as simple as providing a choice on one of the menus.  The code to display either the numeric value or and Air/Fuel Ratio along with a bar graph would not be that hard.  Hopefully, the 0-5v output from all of those various after market Wide Band sensors would be similar.  I'll dev into this in more detail
>


Nope.

Each brand will have their own, slightly different, response curve.  The MegaSquirt code has to provide a way to choose the sensor provider from a menu, and it has a "custom" option so that you can create your own table from a one-off.  The Innovate LC-1 even has a way for you to reprogram the response curve with a PC.

http://www.megamanual.com/v22manual/mwire.htm

Scroll down to the "oxygen sensor" section in the link above (about halfway down the page) for some very informative and detailed tutorial on the whole O2 sensor world.