Checklist

  If you have a vacuum failure in IMC and no 
redundant power source: 

1. Revert to partial-panel, using 
the turn coordinator to keep the wings level. 

2.  Use airspeed and vertical speed instruments 
to ascertain pitch. 

3.  If you have a GPS, even a handheld, heading 
information can be derived from it to substitute 
for a heading indicator. If not, refer to the compass. 

4.  Cover the offending instruments you do have 
covers readily available, don't you?
 
5.  If in a complex aircraft, lower the gear. This 
helps stabilize the aircraft and minimize speed buildup 
if it does get away from you momentarily. 

6.  If your aircraft derives autopilot input from the 
electric turn coordinator, turn on the autopilot.  
(If you're unsure about the AP's source of information 
or its operation, now would be an excellent time to 
ask the manufacturer or your avionics technician.) 

7.  After the aircraft is under control, notify ATC 
and declare an emergency. 

8.  Fly to VFR weather if feasible. If not, ask for 
no-gyro vectors to the nearest radar-equipped airport 
with an ILS.  

9.  An NDB or VOR or LOC may be better than ILS because of
lower workload.  But only do this if the weather assures
you won't need to do a missed approach.