Controlling servos. Do I need a resistor?

I am attempting to do something similar to the project on this page http://www.robotoid.com/appnotes/arduino-operating-two-servos.html. My servos aren't continous, as one will control the steering mechanism of an RC car, and the other the mechanical throttle. Since im wiring an independent power supply for the servos, do I need any resistors?

do I need any resistors?

If your wiring is the usual setup for servos, then resistors are normally not needed.

thanks. I'm wiring it according to that guide.