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Troels,
the altimeter is an ARC EA-401A, it was a factory option on Skymasters. The full part number is 42540-3128. It is a servoed electric altimeter/encoder. The altimeter part works just fine, the encoder part can be troublesome, and expensive to fix. They are pretty common encoding altimeters and it shouldn't be too hard to find one and no problem to install since it could be ordered that way from the factory. If you use one of these altimeters, you have to have a non-electric altimeter as a backup in case of an electrical failure, probably just keeping the altimeter you already have as the #2. I have a repairable core if you are desperate, but it will be expensive to fix I would guess.
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