I always used to ask R22 self fly hirers when we did a checkout on them (they have licence so they should know right?)
Q. "if you lose the engine and rotor RPM needles but have no other indication what would you do ?"
A. "enter autorotation" (they say thinking I suppose that I will think there immediate action like this is highly commendable)
Response. " but what about the perfectly good governor and low RPM horn" I say.
"oh yeah" they say, or even " what about them" they might add
I heard this quite a few times, and was always suprised that they hadnt contrived to kill themselves yet !