guys with air/fuel ratio gauge how do you wire that on your cars.
I have true dual so should I just buy another Oxygen sensor and but it in the X pipe? or it dose not matter if I connect to just right or left sensor.

 

any one please

 

You connect the A/F gauge to the existing O2 sensor signal wire. You can tap into the harness wire (not the sensor wire) or the PCM terminal. One side is a purple wire, the other is a purple wire with a white strip. As I recall, they are PCM pins C8 and C20. You can actually wire both sensors to a single-pole, double-throw switch, that allows you to select either sensor. You don't want to put another sensor far away from the engine, like in the X-pipe, since it will typically not get hot enough to work reliably.

As I am sure you have heard, the A/F gauge will do little more than provide you with a psychedelic light show, and the stock O2 sensors are only accurate at 14.7:1 (idle and low/part loads), not at WOT.

 

Right or left. Doesn't matter. I have mine hooked into my driver's side O2. If you want to look at both, you can install a switch to alternate which O2 wire signal is sent to the gauge.

JR

 

Yes as Injuneer said, it's more like just a psychadelic light show, not too helpful at all. The only real thing you can read with it is if you're misfiring, in which case it will read very lean for about a second or less.

JR