Thanks to everyone who responded to this post.  I found a circuit that uses the O2 sensor to drive a series of LEDs at the site Ed posted.  If the system we are using is open loop then this type of circuit is an add on for a sanity check?  Has anyone used a closed loop system?  Paul Conner is currently using a Microtech ECU and really likes it.  The ability to idle well seems to come to mind.  Rusty mentioned that in using the open loop system that the quantities of how much fuel to inject are stored in a look up table and it is possible to change these values to "tweak" or "tune" the system.  How is this done?  Thanks again for any help.

Joe Berki
Limo EZ