Thanks Jose, I was in the cruise flight and gyro looked OK. Yeh, I
won't break the glass in that situation. However, as you mentioned,
if in the non-precision approach or even on the ILS, if I encountered,
I would probably do:

1. Abort the approach and flight to the miss.
2. Trouble shooting the VSI and ALT on the hold.
3. If I have to break the glass, then do it on the hold, and test it.
4. If things get restored, then go ahead do the approach again.
5. Otherwise, fly to some better weather and land.

-cpu