Electric fan runs all the time

Hello
I have 70 dart with a 360 4 speed. I put a cold case Radiator in it last year.
It has a electric fan that runs all the time so the car barely gets above 145 degrees.
It has a Edelbrock duel plane 7576 intake on it. The one port for the antifreeze on intake it taken by the temp gauge.
I was wondering how you guys hook up your fan so it would come on at 180.
Thanks for your help.

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