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In this picture it's my understanding the one on the right with the white head sends the temperature to the OEM computer (critical sensor) - and the one on the left with the brown head grounds out and turns on the fan at 210ish - but they sell an aftermarket sensor that will kick on the fan as 195 vs the OEM 210ish...but I'm not sure who sells it, just read it somewhere.
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You're mostly correct.

This must be an earlier engine. The single wire sensor would be for the dash gauge. Is this connected with the harness you got from Nick? Or, what was left from the bone yard?.

The "brown head" sensor you mentioned is not in this pic, it's on the actual tstat cover. It is the one that turns the fans on, and is also the one noted a couple posts back.

Feel free to give me a call sometime tomorrow if you need to.
 
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