Another question that may be more suited for Tracy (but I hate bothering him ever and I still hope to make progress while he is away), however, I was re-reading both the manuals for the EC2 and EM2 and looking at the pin out sections for the d-sub connections.  I noticed that for the EC2 it shows pin 28 being for the O2 sensor, however, in the EM2 Manual it shows pin P2-8 as also being for the O2 sensor. Currently mine is only hooked up the the EM2 P2-8 pin. I do not ever recall that there should be two O2 sensors installed and I was under the impression that you would not have two leads off of one sensor to two different instruments.  So, what line of text did I miss (not unheard of and one of the reasons I keep re-reading the manuals....as I experience more, some of the stuff makes more sense with an additional reading even though I doubt I will ever "get" the calibration stuff...sigh) about where the 02 sensor should be connected to. Is it preferred to go the the EM of the EC....or do you have a two wires from 02 sensor, one to the EM and one to the EU....or something else all together? Thanks.

All the best,

Chris Barber
Houston