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Turbo o2 needed cheap, just to test something out

Sorry bud. I don't have a O2 sensor for you. But here are some tips:
-I don't know what you consider cheap, but oxygensensors.com can get you one for around $40 or so.
-Beyond that I would do a few searches around the BBS. There are a few topics on O2 sensors and the basic feeling is that pretty much any 3 or 4 wire O2 sensor will work as long as the thread is the same and there isn't some crazy flange that will limit the thread depth. IIRC most of the guys are finding them in the junk yards off of Hyundai's and the such.

Same harness on the hyundais?

I know that the topics on the BBS talk about the rewire of the O2 connector. I don't believe they're identical. But this is common for some of the new O2 sensors that you buy at autozone (or the like). For example a Bosch O2 that I purchased for one of my T-leg had a simple "connector" block that required you to cut away your old O2 sensor connector and union the connector to the new O2 sensor. The Bosch was a 4 wire that I had to fit to a 3 wire connector. This simplicity of the O2 sensor for the most part is that there is a sensing element that outputs a voltage that is directly correlated to an O2 level in the exhaust. The additional wires on new O2 sensors are generally for heater elements to preheat the sensor to exhaust temperature. I don't know what your testing, but IIRC the ECU runs open loop until the exhaust is to temperature, completly ignoring the O2 sensors readings.

My best advice would be to read this thread in particular.

http://bbs.legacycentral.org/viewtopic. ... 85&start=0

I'm not sure if you are familiar with Vikash, but he's one of the more briliant of us here on the BBS.