Another few quick 1jz questions, hydrofan cooler?

I opened my box with my new, used hydrofan setup, well there is a big cooler in the box. Is that stock and where on earth should i put it? Is it really needed?

Also, there are two leads coming off the tranny, i am guessing positive and negitive, where do those connect? It is a R154. I found a set of wires in the middle of the engine harness, that are not connected. Is that where they connect?