if there is a Pitot port you should be able to run this with compressed air/vacuum and a proportional valve... :smilewink:
You can disconnect the needles with a soldering iron from the axes, and assemble a servo or stepper motor on this both instrumments. But its always painful to disassemble such a masterpiece of mechanical engineering.
I first thought using original instruments the right way in a Simpit, is to leave them untouched. But even the Mil-Spec connector for clean connecting this many little pins on the back lay arround 100$ each. If I had a half F15 like Mike Powel (whose books a REALLY great) shure no way but just for fun, its better to use the re-engeneer way like Thermal says.