I am thinking about running two wires to the front to a digital voltmeter
from the O2 sensor.  If I looped the signal from the sensor to the front
and then back to the ECU, I could interupt the signal to the ECU from the
front with a switch.  This way I could monitor the mixture with and without
the O2 sensor on-line (closed and open-loop).  Am I looking at any
potential damage to the ECU by shutting the sensor's input on and off?
This would be no different than an O2 sensor heating up or failing in a
normal wiring scheme.  I plan to run wire from sensor (I have an '85
w/single wire) to the voltmeter and also to a switch.  From the switch, run
a wire back to the ECU spade connector.  Any problems? Probably only need
small gauge wire, maybe 20 AWG?  This would allow me to tune the AFM at
real driving conditions.

                                                                  Jay

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