I have a FAST (Fuel Air Spark Technology) stand alone single sensor wideband oxygen sensor system. I purchased this for tuning the stock ECM in my Corvette, ultimately I put a FAST XFI kit in the Corvette and this went back in the case. I figure someone here might have a use for it (it's a pretty cool sensor setup). I also built a tailpipe adapter modeled after the FAST factory version. I believe I have the 12' sensor cable (I may have purchased the 22', I'll double check). FAST sends a nice suitcase with the system that makes for easy transportation and storage. Pics on request.
At one time, I purchased the FAST RPM adapter to log RPM. It didn't work particularly well (actually, it didn't work at all). The control unit had the firmware update to add the RPM readout to it and now it just shows random RPM. It doesn't impact the function of the system and FAST will flash it back for free if you send it in (I called them but never bothered to mail it back).
The system looks like this:
http://www.jegs.com/i/FAST/244/170601/10002/-1
I copied this pipe design:
http://www.jegs.com/i/FAST/244/170620/10002/-1
$325 plus freight