2G O2 sensor wiring for blinkly light

[appleyard777]

alright going to install my AF gauge, i know i know just a blinky light gauge basically ... i have a 2g 99gsx.... my o2 sensor has a blue wire, white, and 2 blacks.... which one should i tap into as the signal for my gauge... ive heard diff things from diff people.. THANKS

 

[Ludachris]

alright going to install my AF gauge, i know i know just a blinky light gauge basically ... i have a 2g 99gsx.... my o2 sensor has a blue wire, white, and 2 blacks.... which one should i tap into as the signal for my gauge... ive heard diff things from diff people.. THANKS

I take it you already checked the Tech Guide, right? Wait, you must not have, as I just found a few install articles for an A/F gauge in there:
http://www.dsmtuners.com/forums/forumdisplay.php?s=&forumid=40

Please guys, do the research that we've asked you to do before you post a question. We've plastered links to the info everywhere so you can find it.

 

[appleyard777]

I have checked the Tech guides and read many post about tapping into the ECU to pin 76 for the O2 signal.

I am going to connect to the signal wire in the 4 wire O2 sensor harness. I prefer not to tap into the ECU unless I really have to, since you can get the same signal at the sensor wires, I see no reason to go into the ecu connectors.

I have 2 black wires, 1 blue wire, and 1 white wire. I have checked the voltage in all 4 wires with the engine running. One of the black wires is 12 volt. The white wire shows almost no voltage at .003 The blue wire shows .20 to .87 The other black wire shows .34 to .40 most of the time. I know the signal wire to the ecu has to be the black with .34 to .40 or the blue with .20 to .87. I tried both of these wires. The blue makes the gauge jump from one extreme to the other, while the black seems to be more stable in the stoich zone.

I thought someone might know which is actually the signal wire. I cannot find this info in any manuals.

 

[Perch - Tsi]

Blue is the 02 signal,
white is signal ground and the black ones are the heater for the element, non-polar.

 

[appleyard777]

alright thanks alot man