Celica Forums General Discussion Exterior Air/Fuel Ratio Gauge

I know that the Air/Fuel Ratio Gauge has to be connected to the O2 sensor on the exhaust. Its under the passenger sitde seat under the carpet. I was wondering if anyone has connected one up? Did you connect the signal wire to the harness? If so where is the Harness? Any help would be great!

a universal install guide can be found here: http://www.grandamgt.com/airfuel.html

for a more celica specific compliment to this site, here's something i found while browsing the forums.
to quote mattgts2000:
"Volt gauge sounded fine, i did it differently, but what ever works ya know? and as far as the air/fuel ratio, you have to tap into a blue wire (on my 00 GTS it's blue) that runs under the carpet, on the passenger side of the car, below the fuse panel, it runs along the vertical part. if you have any other questions let me know!"

you can read the rest of what was said here: https://celicahobby.com/ubbthrea...true#Post162978

since he seems to know what he is talking about and if you need even more help...it might be a good idea to send mattgts2000 a pm

iam wondering also anyone who has an a/f gauge detailed pics where you guys installed all the wires would be greatly appreciated thanks

you can locate the o2 sensor wich you need from the 2 on the passenger side under th carpet where the center consol meets the carpet. It snot under the seat is more where the passenger has the feet.
You will find 2 conectors with 4 cables. They have the same color as I remember 2 black 1 blue aand 1 white. locate wich is closer to the engin and you will have to use the cable wich is blue. that cable after the plug becomes black. thats the cable where you get the signal for a/f gauges.

Here ya go!!!!! PIc number 1...the blue wire.

And yeah...the gauge is more eye candy than anything due to the fact our cars have vvti...

thanks for the pic still kinda confused ,so you connect it to the blue wire circled #1 or #2(in the picture top one or bottom one)whats the green wire?
btw can you use the a/f pigtail shown in here?? web page [grandamgt.com]

Hey-hey thats on the pic is after the catalistaor!!! You have to use the front 1 cos the second 1 is cheeting!! You need to see the a/f before the cat!!

You need the sensor after the cat according to Ricepowered.

I don`t agree. I would surely use the 1st one cos that is the real sensor. The cat modyfies the gas so the sensor after the cat is not that good.

Yeah...go with the blue wire in pic number 1!!!! I tried to to hook it up to the second one, and I couldnt get it to work! So, go with circle number 1, blue wire!!!!!!!!!!!!

Actually, it looks as though that the pigtail may fit that clip just fine, it'd be a great way to keep the stock harness in tact, while still allowing you to run an A/F gauge. Good find

lucky grand-am's use 4-wire o2 sensors as well!

so its the blue wire in number 1
and rave so you think it would fit?? coz i rather do it that way its easier and a cleaner install how much do the pigtails normally cost, anyone?

I'm pretty sure the pigtail will fit, you may need to use a ziptie on each plug to make sure they stay secure, but the harness clips look to be compatible. the signal wire is in the right place too.

4-wire clips tend to be pretty much universal, unless of course it's a ford or mopar, in which case it'll have something totally unique.

Luckily, toyota and GM have a lot of dealings with one another, pontiacs especially lately share a lot of things with toyotas, such as sensors, fasteners, seatbelts, etc. I'd say with about 90% certainty that the grand-am pigtail will fit the clips in the celica harness, you may have to trim or rempove the blue rubber boot from the pigtail, and secure the clips with zip ties, but it should work fine.

I have an A/F gauge, I'll order one of those pigtails sometime this month and check it out, it's inexpensive so it's worth a shot.

$15.99 from PFYC, you can order it here! [pfyc.com]

If anything, you can look for a pair of harness clips and make one yourself. go to the junkyard for the clips, and wire it up yourself

thanks i will give it a try a soon as i get my a/f gauge

what brand a/f are you getting?

ac autotechnic to match my rev ind. kinda like vsgts'

does anyone know if our o2 connectors are square or rounded iam trying to find out if this pigtail would work on our cars