Electric Fan Conversion???

[1996k1500]

I have seen a couple conversions from a mechanical fan to electric fans. I was wondering what is the best way to wire it up without spending a bunch of cash. I was thinking maybe a couple fans from a junkyard, or a dual fan from a junkyard. A switch for each side and I'll just turn them both on when in traffic.
Also, should I hook it up just with the switch? Or should I pay the money for the thermostat? I'll turn it on every time I get in and shut it off whenever I'm gonna park it. I already know that. Or does someone have a recommendation to what I should do? I'm looking for power and at least a little MPG increase.
What kindof fans should I use? What cars should I rip them out off? I know I'm putting two on. Not one. Unless it is a gigantic fan with more then 5500CFM.
Anyway. Any help would be awesome.
I just have the stock mechanical fan on it.

 

[LoudnLifted88]

i wouldnt wire them into a switch id either wire them to come on with the key turned on or on the thermostat and i got some fans from a ford winstar van its a dual setup with both fans in one unit side by side you can buy the relay kit off ebay for cheap here is a good write up

http://67-72chevytrucks.com/vboard/showthread.php?t=378483

 

[burganyntan98]

i have my electric fan on a switch and its also wired up to come on any time the ac compressor kicks on. just used a couple of relays to make it happen. and the switch automatically resets when the key is off. so im able to get in the truck and let it do a proper warm up then kick the fan on.

 

[Wildbill0088]

Heres a pretty good thread on a budget conversion: http://www.gmt400.com/forum/showthread.php?10736-How-to-MarkVIII-your-OBS-on-a-budget-!

 

[1996k1500]

Thanks guys! Really helpful stuff. I might have it where it will be automatic but I can override it from the cab. I have it thought up but kindof hard to explain. But anyway. Thanks again.