Just out of interest, Mr Avro fitted an AoA indicator to the 1940s designed Shackleton, in service until the early 90s.
Yet Mr Boeing was quoting tens of thousands of dollars to fit similar to the NGs.
What price safety? With one of these indicating gibberish during the takeoff roll or post bird strike would the crew have had an extra clue as to what was wrong?
Unable to post photo but if you google Avro Shackleton Instrument Panel Photos it’s visible up on the coaming left hand side beside the ‘g’ meter, some pics clearer than others.