John Gilbert wrote:

Angular guages perhaps. Sweeps of 180 to 270 degrees are quite
readable, I agree. But what does the study say about altimeters with
dual needles, that rotate multiple times? How many times have you
misread the altitude or had to think hard to get it right? This has to
be the most confusing instrument to read, unless you don't really care
about knowing about that last +/- 1000 feet.
Well... hardly ever, but maybe that's because our meters are, well, in
meters :-) That means a full spin round is 1000m. Not something you'd
easily misjudge I think.

André