Raw Input Plugin axis ID confusion

I’m trying to use my Thrustmaster TMX sim wheel with a project. The Raw Input plugin documentation says, “[in this example] the steering wheel is reported by the driver as Axis 1, the brake is reported as Axis 3, and the gas pedal is reported as Axis 4. In the RawInput plugin settings, each input must be entered into the array at the corresponding axis from the device driver.” In all the documentation for this wheel, no axis is labeled with a number - only X/Y/Z. How does one find the relevant number label for the relevant axis?