Ok, I got The taurus fan from the junkyard. Also picked up 2 of those monster blue relays for the fan with the part it plugs into as well.

I think I've figured out how I'm going to wire it up. I'll use 2 relays, one for high, one for low.
I'm going to run the low speed on that switch from summit from earlier in the thread (thx msrwerks!!). I figure the 200?F on and 180?F off should work well.

I'm going to have a toggle switch that will be powering either one of two relays. One side to the low speed through that temp switch, so the temp switch controls when the fan is on. The other to high speed, just on all the time. That way if low isn't cutting it for some reason I can run on high till it cools down. Low and high will both have an LED run into the cab so I see which is on if it's dark out.

Here is a diagram I drew up of how it's going to be laid out:


In doing some research on how many amps that relay is, I did see a few times that it is used to control the starter solenoid on the Nissans. Also seems they are prone to failure so I picked up 2 extras while I was there. Total cost for the fan and 4 relays, plus 3 cans of pepsi: $30