I just finished installing a Ford sensor my Foreign Auto parts guy got me. It was a short harness, about 4-6" after I snipped off the Ford connector, and I soldered the old harness in place. There is one black wire, two white. I found that neither of the white is common to ground (the case of the O2) so I decided polarity is fine either way. Just make sure your iron's hot, as the (steel?) wires are not as easy to heat as copper. A little heatshrink and careful reuse of the original protective sleeve, and you've probably saved $50-$75.
Unfortunately it looks like that may go to a new AMM in my case. The O2 voltage is still .8-.9, with the only changes coming at throttle closed, falling back to idle from 2K rpm.
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