These Chinese Falcon VSI's are largely junk.
The rotating shaft separated from its bearings.
Could have been a jar from handling as it worked
for awhile. It was handled by a few different people in
the machine shop when the adapter was made to mount
it in an existing hole on the instrument panel.
These are much like clock mechanisms.

I had to take it apart and reassemble it.
Spent about 2 or 3 hours on the job.
Steep learning curve.

I don't recommend them. Not worth the $100 you
save over the equivalent UMA brand  VSI made in the states.


Paul Lamar