[Alan Anderson]

The Dashboard data includes the individual motor control values. You can view it in graphical form on the default Dashboard screen. To see actual numbers, you should be able to find it and probe it in the Build Dashboard Data vi.

At first glance, what you're doing with the joystick values looks exactly right. You might want to add a dead band to the rotation value so the driver isn't required to move the joysticks in perfect tandem in order for the robot not to spin at all.