A/F Gauge Wiring Help - The Saab Link Forums

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Old 07-07-2006, 02:08 PM   #1
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A/F Gauge Wiring Help

I forgot which wire to tap into in order to get this dumb A/F gauge to give me an accurate reading.. pics would be sweet

thanks guys
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Old 07-07-2006, 02:43 PM   #2
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green wire on the cars harness...black wire if you tap into the o2 sensor itsself
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Old 07-07-2006, 03:34 PM   #3
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k, i'll give it a shot
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Old 07-07-2006, 04:25 PM   #4
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i couldnt figure out where the harness one your talking about is? is it the one right on the firewall with the red and green wires.. or theres one to the top right of the engine with green, 2 silver, and a black wire.. i just don't know which one to tap
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Old 07-07-2006, 08:44 PM   #5
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Not sure if its the same with the T7 as it is with the t5 but heres some pictures of where I tapped the green wire on a T5.




The Silver pipe is the delievery pipe headed to the throttle body and the connection is for the front o2 sensor, dont do it off the rear. Hope that helps.
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Old 07-07-2006, 11:18 PM   #6
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just follow the wire from the o2 sensor.

and just do you know...narrow band a/f gauges are sort of pointless, but they can be fun to watch jump around
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Old 07-08-2006, 11:06 AM   #7
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hah thanks, i'll take another look... i tapped the black wire last night and it seemed to work.. but i'll try this one as well

are far as the gauge it says i run healthy when i'm just cruising but when i step onn it she runs WAY RICH.. need to fix this somehow
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Old 07-08-2006, 11:22 AM   #8
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OK, the one with the black, silver, and 2 whites runs to the front o2 sensor.. i tapped the black.. the other pic with the green and yellow and gray and what not is the one that goes to the rear o2 sensor. u said not to tap the rear o2 so i tapped the front black wire.. does this seem correct?
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Old 07-08-2006, 11:26 AM   #9
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Um -it's normal to go full rich when you "give it gas" - it's supposed to... assuming you tapped the FRONT 02 - even the rear however will read a little richer tho upon serious acceleration.
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Old 07-08-2006, 05:53 PM   #10
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yea the narrow band sensor is showing the right thing if it goes way rich under WOT
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Old 07-08-2006, 06:35 PM   #11
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k thanks for the help
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