Installed Your Own A/F Ratio Gauge? Come in!

I need help, I'm not sure what wire is the signal wire for the oxygen sensor. The colors I have are red, black, off white, and violet. Someone on LS1tech said the violet was the heater so I tapped into the off white, but my gauge doesn't work right when it's connected to the sender.

Can anyone shed some light on this? Thanks!

it's the violet one and on the other side it is the violet one with a stripe wich i believe is a black stripe.

you should set it up on a toggle switch so you can monitor both o2's instead of one. or just get another. even thought they aren't terribly acurate they do give some readings.

Ok, thanks, I figured that was it. Does it matter where you tap into the signal wire? Autometer shows if after the connector but I did it before so I didn't have to trace a bunch of wires through their tubing. I see no reason why it matters, but just wanna make sure.

Thanks man! :p

i did it before the connector because it is cheaper to replace a o2 then a wireing harness lol

Good Point, but I tapped in up by the PCM, just easier I guess.

Ok, I took it for a spin, I heard it supposed to bounce around a lot, but it goes from all the way lean to the first couple ticks of rich. Then when I'm costing down a hill, it won't register at all. Is this because my PCM is "re-learning" or what? Thanks

It was wise not to tap in between the sensor and the sensor's plug. this can easily ruin the sensor.


Please do not attempt any tuning whatsoever with this guage. Please please please.



I have on hooked up to my stock O2, and while the wideband sits at 14.7, this thing is all the way rich to all the way lean.

Not terrilby accurate is an understatement.

Well theoretically, 14.7 is the perfect ratio. The PCM is continully trying to maintain this 14.7 but it does not incorporate "Fuzzy Logic" and continually overcorrects itself, making the sensor bounce back and forth. The sensor is extremely sensitive so the slightest change will throw it off. I don't plan on tuning using this thing, I'm still learning why the readings say what they do when they do. At WOT the sensor stays still and won't bounce back and forth, this is the only time an A/F gauge can give some good feedback.

Originally posted by Mikael
It was wise not to tap in between the sensor and the sensor's plug. this can easily ruin the sensor.


Please do not attempt any tuning whatsoever with this guage. Please please please.



I have on hooked up to my stock O2, and while the wideband sits at 14.7, this thing is all the way rich to all the way lean.

Not terrilby accurate is an understatement.
the gauge only reads at wot