nafod40 wrote:

When flying in the military, we used to play games and see what we could
fail and still fly the plane IMC. I found I could get by with a turn
needle, an AOA gauge, a balance ball (or a balance string) and an ASI.

Not very surprizing. Actually, the legal minimal instrumentation for
cloud flying in Switzerland is AI, Vario, Ball, Compass and Needle (and
radio). The glider instrument rating involves flying with those.

So the turn needle is the only thing seriously lacking in a glider.

Why should it be lacking in a glider? It doesn't in ours.

Stefan