It does not have to work for long.
All real gyro aircraft attitude indicators self erect after
a certain delay.  You don't stay in a turn or dive
forever.

"Most panel mounted gyros use gravity sensitive control vanes porting air
exiting the gyro housing. An electric fan blows air through 4 ports covered or
opened by the control vanes creating the needed balancing torques."

Get a couple of mercury switches out of your thermostat
for a mems based unit :)

Paul Lamar



You already have the sophisticated equivalent of those mercury filled
thermostat tubes on most aircraft instrument panels ..... the ball in
the curved tube in the needle and ball instrument.  It is another
gravity sensor like the accelerometer.  :-)

SD

Yes but there are no wires coming out so my computer can sense it.
I would use that periodically to re-erect the MEMS.
If the GPS is saying the altitude is constant and the aircraft is
not turning time it is to re-erect the MEMS.

Paul Lamar