Aftermarket toggles switches?

[dalaigh]

I'm in the process of putting gauges in my car, and part of it requires some custom dash work. To make it a little cleaner install, I was thinking about putting aftermarket toggles in to control things like e-Fans, headlights, wipers and such. My question is, is there anything I should be aware of before I attempt this? I'm not much of a wiring guy and I don't know if I can just wire the toggles straight in or if I need fuses or relays to make them work. If anyone has a diagram on how to wiring them in that would be great. I was thinking of using a three way toggle for the headlights and two speed wipers, and just 2 way toggles for the fans and anything else that's just an on/off application.