With the Taurus fans the 30 or 40 amp relays you would normally wire a fan with will melt. This is why you need the solenoid at least 70 amps. The one I got is 85 amps, like for a winch.
It would be difficult to use the wiring from the donor car because they use a computer fan controller which I'm told also controls other things and is integrated with the vehicles wiring.
Without a thermo switch of some kind your engine will run too cold. The fact that its a 2 speed fan will usually be irrelevant, most people anyways just use the high speed. I have no idea how to wire it for 2 speed action.