Flaps retracted is interesting since it seems like the ac gained very little alt.
Also, on the original B-17, there were 4 red propeller feathering buttons under the original ALT, ASI, and Turn & Bank gauges for F/G models according to the documents at Zenos and 909 cockpit pic below.
http://www.zenoswarbirdvideos.com/Images/B-17/17CCL.pdf
http://www.zenoswarbirdvideos.com/Images/B-17/17CCR.pdf
