There really is no single right way. I work on Honda's mostly and the fans come on instantly, if i remember right, with the trinary switch it is delayed for a few seconds and runs on after(I know my brothers 89 firebird was like this) most window mounted ac units for houses trigger both at the same time. point being, if you have one switch already, use it, it will work and both are just as easy to wire, especially with the condensor fan being separate. If you have a strong enough relay (40 amp ??) you should be able to run the fan and the clutch on the 1 relay. Just make sure to use a heavy guage wire on the source and accesory side of the relay, 14 awg should be more that enough. Lastly, just make sure the condensor can get fresh air, it should work fine.