Best way to wire up AFR gauge

[MThrizze]

So I have in my possession a greddy wideband afr gauge, I would like to mount it onto the steering column and wire it up there, now here are my questions.
What should i use for the constant & switched 12V source, and where do we have an access port in our firewall to run the wire for the gauge from the 02 sensor?

[RRSperry]

My question is where are you installing the sensor? Will you use the sensor as narrow band output for the ECU?


Since you have a 99, you have 4 narrow band sensors. 2 precat, and 2 post cat. The post cats ones are of no value location wise for a wideband. (after the cat). The 2 precat sensors are not in a good location for a wideband. (too close to the head, too hot) So, you need to weld in a new sensor bung. About the only usable place is right before the cat on the drivers side. The bad part is that you can only sample 3 of the 6 cylinders

If you not forced induction, you have no reason to even think about installing a wideband.

[MThrizze]

I thought the gauge was a wideband but I did some research last night and found out it was a narrowband that costed over $370 at the time it was bought, It was given to me by a friend for free who left the country. Anyways I just never feel my car is running right with this off the shelf software and I really wanted to see whats going on, Yeah I know I can only sample 1 bank but it would be fair to assume that what one bank is doing the other is too? I was going to weld a bung At the end of my longtube right before it connects to section 1. And is it even worth connecting this gauge because it isnt a wideband? I did some research on the Evo forums and some people said the gauge might be useful for N/A. My goal is to find out what the hell my AFR is at WOT.

[Brent 930]

I would think if the OE O2's can live in their location so should yours, but you do want to be at least 12-15" downstream from the heat source. Since your OBDII you will have to get a bung custom welded.

A narrow band could be useful for NA but not for FI. I think it would be more useful for FI with a wideband and if you have a race exhaust where you can see the avg. of all 6 cylinders.

For under the dash I used the switched power for cruise control since I removed it. You can route wires thru the power distribution box to get past the firewall.

[shaeff]

I had one of those Greddy AFR gauges for my MKIII Supra. It was sold to me as a wideband, and had an analog gauge that looked like a wideband, but alas, I'd been had. :( Sold it for more than I bought it for, though.

Grab yourself a real wideband, or don't bother. Unless you plan to get a custom tune on your N/A car, there's really no point in having one anyway. If you're FI, that's a different story.

[berti00]

yah if your not FI you don't really need one... no point. however if you want to do it the right way get the full kit AEM wide band comes with the o2 sensor its kind of a bitch to send the wiring from the gauge inside through firewall down took me and my buddy about 3hrs to do the boost gauge and AFR gauge... dont forget you have to have a pre drilled hole so you can put in your wide band sensor