While working towards my private pilot's license in the United States in 2004-2005 (in a steam gauge only airplane), I very much remember my instructor covering one or more instruments to simulate failure and recovery techniques. He used covers which are commonly available in pilot shops:
Now that more and more pilots are training with glass cockpits, I was wondering how covering instruments the same way would work. For reference, let's take the Garmin 1000, standard in the Cessna 172 Skyhawk, which I have to guess is one of the most common civil aviation trainers:
I am, of course, assuming it would be much more difficult to cover the altitude indicator, airspeed indicator, artificial horizon, etc. on a glass cockpit display, not to mention being a questionable practice on a multi-thousand dollar LCD screen.
Then it occurred to me that perhaps the glass cockpit manufacturer would just provide the ability to temporarily disable specific instruments. But (at least for the G1000) I did not find this feature in the manual.
To summarize, my question is, how do flight instructors/examiners simulate the loss of one of the "six pack" flight instruments in an airplane with a glass cockpit?