In AH clipboard, think it's options, controllers, go to map controllers. Up at the top will be a drop down list of the controllers plugged into your pc. Your throttle should be there on the list although it may not be the first one, if it's not on the list windows isn't seeing it for whatever reason. But for now let's assume it's there. Select it. Now you can assign the throttle axis to it along with any other buttons. Double click on throttle axis from the list. Calibrate it. Done.
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