I'm thinking about getting efans for my truck I'm on a budget of $200 I'm thinking about getting the Mark vIII fans from a Taurus but which year to look for? and getting a Hayden controller from autozone. and when I get the parts should I get a switch to override it for back up

 

Your getting into a critical change.
The fans take high current running full on.
Be sure the controller can handle the current.
Do the wiring with correct heavy wire sizes good terminal ends and good soldered connections and fusing where applicable..
Any bypass switch circuit has to be able to handle full current of the fans, not being in the controller soft circuit.
Good luck.