It depends (I think) on whether the VC Autopilot is built into the model or it is in the panel.cfg. If you do want to use the default A/P, the you will need to remove the A/P 2D gauge and possibly the A/P gauge in the [VCockpit.xx]. If you don't remove all the entries, then the 707 and default Autopilot will/could conflict with each other, which could lead to the autopilot not working at all.

Mark