Jus read this thread, and wanted to comment on the whiskey compass issue. My experience contrary to some others is that the "S.I.R.S." compasses, mounted high in the windshield of a cub work really well. They still tumble in a really steep turn but then orient properly. Ive put these in three airplanes where I was told that any compass would "just point to the last weld" and they worked just fine in all three.
i see absolutely no point in installing and carrying any instrument that is not functional or useful. The S.I.R.S. compasses work, maybe not in every situation, but waaaay better than anything else.
Also, I see no point installing a Turn Coordinator....a better device would be a Reiner ball/bank instrument, and if you want a "get out of cloud" instrument, consider one of the ADHARS recently approved by the FAA, like a Dynon D-10.
MTV