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Re: electric fans question
The fans draw alot of current and a relay is capable of handling this current, the thermal switch is not. Use the thermal switch to control the windings of the relay and the relay contacts to switch the fan/fans on and off. A toggle switch to override the thermal switch would be a good idea. Monitor your water temp closely with the elec fans. I've heard horror stories of guys burning up their expensive engines when/if the fans stop working due to a bad thermal switch, relay etc...
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'72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.   
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