I have an Autometer air/fuel ratio gauge. I was under the impression this wired directly to the O2 sensor. However the O2 sensor is a 1-wire and the gauge is a 3 wire (1 being ground).

Do I need to get a different O2 sensor? Or splice it in somehow?

Thanks!

Scratch that... I got it!

How much was the gauge? If I cheap out I'm going to do this instead of getting a gauge.
https://www.thirdgen.org/newdesign/tech/o2tuning.shtml

I thought you needed a heated O2 sensor like the one autometer sells for the gauge to work properly all the time.

If its not heated the readings would be off untill, pretty much, the closed loop when the O2 sensor is warmed up.