2. Old Air Products has two ways to control its A/C systems. You can use the standard push/pull cables, just like the Mustang had originally, or you can opt for full electronic controls. The cool thing about the electronic controls option is that you can use stock Mustang dash sliders that are converted to electronic control or you can use any of the optional custom dash control panels. For our fastback, we’re using Old Air Products’ horizontal dash control in black.