The Taurus fan is a single fan - I think you are referring to the Contour Fan.
Here's my writeup - the original:
https://www.dropbox.com/s/wdvxqfd1tnhcpy3/Electric Fan 26in Radiator.pdf?dl=0
You need a 70A relay for each speed that you are going to use. Using anything less will drastically reduce the life. My writeup matches the specs of the wiring in the original Contour.