lessthen12

I'm installing an a/f ratio gauge on my car and I don't know which wire to ecu(color) is the wire from the o2 sensors that tells the ecu the a/f ratio. Could somebody tell me what color this wire is. Thanks

SSpdDmon

iTrader: (10)

There are actually two wires the PCM reads. I believe the signal is the purple wire and the tan wire is signal ground. The two brown wires are the 12v source and heater ground. See this thread for more details. But beware...if you're hooking it up to your stock narrow band O2 sensor, the guage is just a light show unless you're trying to read a 14.7 AFR.

https://ls1tech.com/forums/pcm-diagnostics-tuning/342438-lc-1-how-hook-up-efilive.html

Black02SS

iTrader: (36)

Also, I have seen personally on three different cars it effects the voltage causing the tune to be a little screwy. I would personally stay far away from them as mentioned above, its only a light show really.

WS6FirebirdTA00

iTrader: (33)

so you would recommend taking it out? ive got one only because i didnt knwo what else to get lol, if its gonna effect it taht much can i take it out and leave the marine connection in place and get a new gauge for it?

i dont even know what other gauge to get that is on the cheaper side