I've been creating a new version of the Bugatti P-100/110 for FS9/X recently, and have run into a sort of block with making the VC.

The original aircraft had automatically extending/retracting gear and flaps associated with the altitude the aircraft was at by using air pressure.  I would like to simulate this, but am at a loss to find a way to do it.  I've searched for individual gauges that would work this way, but have only been able to find "high-tech" gauges that would work for the flaps.

In any case, I want to have a small panel in the VC (with 3D controls) that you can adjust to make the gear and flaps lower at any altitude.  I would also include a manual gear control and flap handle, but both would be slaved to the automatic control.

I'm guessing there's a lot of XML work in this, and I've searched through the back records here, but I don't even have the foggiest clue what I'm searching for, really.  This is pretty new territory for me, so I am desperately searching for some help.

If someone could even point me in the right direction (tutorials, XML descriptions, partial gauge/part code) I would be extremely greatful.