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Dead simple for the setup I got - the thermoswitch handles the full current load so I didn't need to wire up a relay - just one hot wire with a 30 amp fuse (I hooked this to the alternator since it was close by) going to the fan, then grounding back through the thermoswitch to a ground under one of the radiator bolts. The thermoswitch I used has a long thin brass probe which just slips through the radiator and is secured by a little metal clip. Very simple installation.
Note, however, that such a fan will ONLY cure overheating when the car is barely or not moving - i.e. when the overheating is due to lack of air flow through the radiator. If your car overheats on the highway or under a load while the car is moving then you are likely suffering from a lack of coolant flow and the fan won't help.
Actually - my car used to do both - overheat while sitting still and under heavy use at speed on the highway. The low speed overheating was cured by the fan but the high speed overheating remained until I finally replaced the dinky 1 1/4 inch ID original exhaust system with a header and a 2 1/4 inch system. I think the backpressure was causing overheating. Mine is a sort of iffy system, though. My car is a '63 but must have suffered a fron end collision in its past sometime and had the entire front clip replaced with 444 parts. Now it has the B16 radiator (somewhat smaller, and with the bottom hose on the wrong side) trying to cool a 2.2 liter B20E engine. 37.5% more engine to try to cool - so I guess its fairly marginal. It seems better with the reduced backpressure, but we still haven't had any truly warm days here in St. Louis yet to tell for sure. I may yet need to recore the radiator to get more flow.
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