Electric Fan using stock temp sensor

[idahotuner]

I have been reading the different ways people have hooked up there electric fans. i am going to use the diagram on the write up section of this forum http://www.nicoclub.com/archives/electr ... iring.html but what i am wondering the stock sensor doesnt it work just as a thermostatic switch going to the ecu. so once the engine hits operating temp the coolant sensor closes and then send the signal to ecu letting it know its working at operating temp. around 170*

in the write up he uses a second thermostatic switch instead of running off the factory one, seems like i should be able to run off the factory one and when it hits temp it will turn my fans on at the same time the thermostat opens. i am planning on wiring them in tonight so an answer would be nice