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red - hot
black - ground
The 3rd wire gets tapped into the BLUE wire on the O2 sensor.
In order to get a solid read on the gauge, it needs to be soldered.
A few things to note:
1. It is normal for the graph to "bounce" at idle and cruise.
That is a correct reading
2. This guage will not tell you ANYTHING about your actual air/fuel ratio at throttle.
If your foot is on the gas, then it should just be showing rich. You need a wideband to read the actual A/F for tuning purposes.
3. This gauge is basically only good knowing if your O2 sensor is working and making sure your ECU is undulating fuel at idle/cruise like it should.
... other than that, it is just a pretty light show.
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Forum for every generation Toyota MR2. Including the AW11 and SW20.
need help with Air/Fuel Ratio Guage
Linear Mode
