Futaba, Tokin and Murata all make piezo gyros of the kind you have in 
mind. A simple autopilot can be built without using a computer, by just 
using the gyro signal to change the duty cycle of a PWM signal which 
directly drives a usual model servo. But since the gyro output is rate 
proportional a proper heading or attitude hold cannot be maintained. 
Iow, look for an electrolytic level sensor, a hall compass, and a 
barometric sensor as a better starting point for an autopilot.

Peter
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