I've noticed that ArmA has, at least in planes, a throttle control, I'm using a keyboard so if I press throttle up the imaginary control moves up and the throttle stays constant, which is great since I have more control over my speed. However I am missing a throttle indicator, I can't really pinpoint my speed using the throttle. I can do guesswork but it's not as effective as if I had a throttle indicator(which defers from the speed indicator ofcourse)
Perhaps it's in there but I haven't noticed it? But I don't believe so.