I am installing a APC Air/Fuel Ratio Gauge i Know how to hook everything up like the ACC and NEG. but i have no clue were my o2 Sensor wire is. I have a 1999 Dodge Ram 1500 5.2 sport. If theres another easier way im up to suggestions.

 

Does it tap into your existing sensor harness? If so, your O2 sensor is on the passenger side, in the exhaust, right in front of the cat. Four wire sensor, so, make sure you get the right ones.

 

My Split Second A/F meter connected to the o2 sensor output wire, and the o2 sensor ground wire. On my '99, these wires come into the PCM on the right hand plug (as you look at the PCM from the front). One is tan with white tracer and the other is black with light blue tracer. I made my connections just off the PCM instead or running new wires down to the o2 below.

 

Wheres my the box with the wires in it? what color should it be?

 

PCM is mounted to the firewall, on the passenger side of the engine. There are a boatload of wires going to it.

 

I told you what color.

 

narrow band gauges that tap into your existing o2 sensor are worthless.

 

Really? How so?

 

i got an autometer wideband for 188. And autometer had a 60 dollar rebate going at the time:

this is the cheapest place for a sport comp autometer wideband:

http://teamc.com/i-5047337-auto-mete...ratio-kit.html

 

a narrow band is completely inaccurate at anything above 14.7. this is due to the temperature variable when an engine is running rich. a voltage signal in the rich range is entirely dependent upon temperature as one voltage can indicate entirely different ratios. temperature is unmeasured with a narrowband sensor.

wideband sensors contain a current pump that determines actual o2 concentration and the level of o2 required to re-establish stoichiometric pressure AFR.

why would you need a gauge to tell you that you ARE running at the correct A/F ratio?