Chris W wrote:
If you were about to go on an IFR flight, and for some unknown,
hypothetical reason you had to pick one instrument in the standard six
pack that you could not use, which one would it be?

If I had to leave an instrument behind on takeoff, my choices would be:
1. VSI
2. DG
3. AI
4. TC
5. ASI
6. ALT

If I was going to have a single instrument fail during flight:
1. VSI
2. TC
3. DG
4. AI
5. ASI
6. ALT

-cwk.