Ecotruck assuming that you have a SBC engine twith a stock manifold you should have 2 or 3 places to insert a probe usually on a stock manifold there will be a plug or 2 also on drivers side behind the 3rd sparkplug 1 on the head one on the block there should be a waterjacket plug also check your radiator sometimes 1 if not 2 plugs there if you have a manual then there will definately be 2 plugs auto maybe just 1.
Or just swap out your waterneck. add in a probe from jegs/summit as mentioned befoe easy job to do while your at it you can add that new thermostat.
I had one of my old race cars set with the electric fan on a sensor and also with a bypass switch the sensor was because I forget to turn it on 
Trans-Dapt Performance Products 9468 - Trans-Dapt Performance Chrome Water Necks - Overview - SummitRacing.com
pickup a summit fan or better yet check out Autozone if they have them buy you crazy 40% off sales goinng on now.
Good luck
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2012 Chevrolet Traverse *active*
2002 Oldsmobile Alero GLS *active*
2002 S10 2wd p/u 139,000mi. *active*
1975 Corvette Stingray *active*
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1995 Tahoe LT 250k *Sold 2011*
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