a/f guage questions

i have already wired up my a/f gauge on my 90 integra. i have the black wire to ground, red wire to power, where does the purple wire go?

i traced the wire going to the o2 sensor, do i just connect it there? let me know.

FYI if you don’t have a wide band o2 sensor… the gauge is useless.

The answer to your original question is yes, although he is right about the wideband O2 thing.


gadgetseller’s gauge is somewhat useful. Resolution isn’t near that of a true wideband but it is amplified compared to a regular autometer

modified autometer