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Water jet controlled by Wii type remote and sensor

I need to be able to create a water jet gun that I can control with a Wii remote and sensor, or something like it. I would use servos to move the jet, but dont know how to set up the sensor and program the microcontroller. If someone could create a tutorial for this it would be awesome. Also, the setup needs to be waterproof, and I dont know if any servos are or how to waterproof the sensor without blocking the signal. Any help is much appreciated.