I have the optional harness for the SBC-id and have searched different forums for a installation procedure and which is the proper O2 sensor to tap into and am now coming up with a contradiction on whether the front O2 or the back O2 should be used. Is there anyone that has installed this harness and may have some pointers for me???

Thanks

Well it looks like I am talking to myself, but that is nothing new...here is some info I hope someone else may find helpful down the road.
For use of the SBC-id optional harness thewires coming out of the SBC harness are as follows:

BLACK wire = ground
BROWN wire = Data 1 (A/f, TPS, MAP etc.)
YELLOW wire = Data 2 (set up for degrees C)
GRAY wire = Data 3 (set up for volts)

All fields can be adjusted to monitor whatever sensor you want. You need to find the proper frequency to tune the controller to though to read correctly. I am working on that one for the KNOCK sensor...time will tell.

Oh use the rear O2 sensor for the A/F sensor which is located at location B17 on the ECU and is a white wire

Engine coolant is located at B18 and is a blackand yellow wire

I used an "ignition on" 12V wire located at my Day Time Running Lights relay (behind the glove box [blue one]) for VOLTS.

Happy Trails.

:D