WHBM,
safetypee and gums are absolutely correct.
When we did CofA air tests on VC10s, we always had a third AoA vane mounted on a plug that replaced the glass of one of the cabin windows and an AoA indicator connected to it mounted on the pilot's instrument panel coaming. During stall tests, one crew member was required to watch it like a hawk and shout if it approached (I think) 16degs before the stick pusher pushed.