If you take the measured voltage. and subtract 2.5 from it, it should give the 0 to 1 volt readings that you are used to working with. The conversions to actual ratio should be correct then.
This is theory only; haven't checked it..
If you change the resistors in the A/F gauge, it may "load down" the sensor output as seen by the PCM, and cause it to dio strange things. Not sure about this, but a thought for consideration.
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