As far as the electric fans go i would hook them up to a toggle switch. it will save it on the highways and speeds that you wouldnt need a fan because they will die over time, trust me i know i ran mine to the ACC and burned it up in a matter of months. If you dont have ac you could use the ac switch/relay setup and wire it to the fan so you wont fry your wiring and you can turn it off at highway speeds. just my thoughts though