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Discussion Starter · #1 ·
I just got This gauge New but it dosen't have any instructions. I checked Greddy's site & ran a search but didn't find any info. The basic wiring looks easy & shouldn't be a problem. However I would like to 86 the stock O2 sens & just use the Higher band O2 that came with the gauge. Can I wire in the stock O2 conector harness w/o any problems or do I have to run both? If I can wire in the stock harness which wires go to what. The stock unit has the Blue wire (To Signal-OX) & 2 black wires I'm sure are for the O2 heater. The Greddy O2 is a 4-wire. 2 white,1 Blk & 1 Grey. FWIW I'm replacing the stock O2 housing with a full 3" custom DP using a flange purchased from Dean Marcum. Reason I'm wanting/Need to get rid of the stock O2..

Thanks
Steve
 

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Dr Wheelspin Rh.D.
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There is a green wire that comes off the GReddy harness that you use for the ECU. If yours does not have a green wire then it has been damaged or modified.
 

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Discussion Starter · #4 ·
Bishop- Its a Grey wire. The O2 was never modified. Its from a brand new Greddy A/F Gauge kit that I got in a seald box. They just didn't pack the instructions. All I need to know is can I wire it in with the stock O2 conector & Use it to replace the stock one or do I have to use both? If I can use just the Greddy O2 then any info on the wiring would be great.

Thanks
Steve
 

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Dr Wheelspin Rh.D.
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If your box does not have the instructions then it has been opened. You need to tap that wire into your stock O2's output wire. You'll need a wiring diagram from your year Supra or put a voltage meter on each of the 3 wires from the O2 sensor with the car running (0-1v scale).
 

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Discussion Starter · #6 ·
Ok, Thanks Bishop.
 
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