hubada26

i am wiring up a air to fuel ratio gauge in my car. i need to know what wire to connect this too. wait before you call me an idiot, i know it goes to a signal wire from the oxygen sensor after the connector. but i dont know which one and i can not look at an owners manual becuase i dont have one and wouldnt matter cause my car is peices part of different model years.

The Great Cornholio

I know it's probably too late, but if the A/F gauge you have is still unused and in the box return it and get a wideband O2 gauge/datalogger instead. It will give you A/F data you can actually use, as good or better than that obtained during a dyno session. It's more expensive (of course), but it comes with it's own dedicated O2 sensor, and only requires a bung be welded into your exhaust, ahead of the cats if your car has them, and a power source.

jishead

If I have a offroad H (prochamber actually) and a predator then could I just use a downstream O2 bung and take out one OEM O2 sensor and have the predator ignore it's absense? This way I could use an existing MAC pro-chamber bung? That would be cool.

The Great Cornholio

I don't know if all aftermarket O2 sensors supplied with wideband A/F gauges are the same thread size as the OEM sensors. They probably are, but in case they are not it's only about $20 to have a new bung welded on at a muffler shop. Also with an O/R pipe you can place the O2 sensor in the tail pipe if you're not going to run the gauge all the time.

hubada26

okay well thats great and all but i still need to know what wire i hook the gauge i have, up. any one

hubada26

actually if any one has a wiring diagram of the tranny/oxygen sensor harness that would be great i just need to now which is the signal wire so i dont start a fire by guessing.