Running fans constantly makes it seem evident you have a short-fall elsewhere in your cooling system.
There are plenty of write-ups about wiring electrics fans, even S-Chassis related just on Google/240sxtech.
Anyways, I have my Flex-a-Lites wired through a thermostat. The kit I used is available at O'Reilly Auto stores (Part Number #3652 or 3654); Comes with all necessary wiring, a temperature prong for the radiator, and a switch to adjust the fan temperature. I run my Flex-A-Lites off 2 of these (one for each fan; kicking on at different temperatures). They are wired with an inline fuse, so if one fails, the other is there for backup.
Lastly, they are powered directly from the fusebox post. So when the car turns off, the fans stay on until the kick-off temperature is reached.
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