Bonanza secondary airspeed indicator broken

Normal flight in Bonanza, Garmin displays correct airspeed (say 135 kt) but the secondary airspeed indicator shows only around half that. The indicator DOES move, it starts at zero on the ground, and does increase with aircraft speed, but never shows more than around 85 kt. I think this is new behaviour as I’m pretty sure it originally was working OK.

Hello,

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