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Dan, my 1973 T337G also has an ai in knots with a POH in mph. My placards however use both kias and mph. The placards were done by Riley and may have been a way to address this issue. I was told by the previous owner that Cessna was changing over to kias in the early 70's on their airspeed indicators and that the POH's lagged behind. I could send you pics of my placards and you could have stickers made if you wanted to go that route. I would not change the airspeed indicator. Hope that helps....feel free to call.
Brent
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