[Jared Russell]

Are you calibrating the gyro? The WPIlib Gyro class does this automatically during the creation of the Gyro object - be careful not to bump the robot while it is booting!

To verify that the hardware works, you could try hooking the signal pin up to an oscilloscope and you should see a stable voltage. Rotate one way, the voltage should climb; rotate the other way, the voltage should descend.