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Boat House
Anybody have one of these speedo’s ?
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<blockquote data-quote="Ironhorse2022" data-source="post: 491852" data-attributes="member: 31989"><p>I was told by the PO that this is original equipment. The swing arm has a hole in it facing forward. Above it is a brass tube with a ball or plunger of some sort in it. I think it works by water being forced into the hole which pushes up the ball. This compresses the air above the ball. That air chamber is connected to the Speedo gage by a long tube. So essentially, the speedo is an air pressure gage correlated to speed. Is this correct ? I suppose the swing arm can rotate so it isn’t knocked off if you hit some Floating debris ?</p></blockquote><p></p>
[QUOTE="Ironhorse2022, post: 491852, member: 31989"] I was told by the PO that this is original equipment. The swing arm has a hole in it facing forward. Above it is a brass tube with a ball or plunger of some sort in it. I think it works by water being forced into the hole which pushes up the ball. This compresses the air above the ball. That air chamber is connected to the Speedo gage by a long tube. So essentially, the speedo is an air pressure gage correlated to speed. Is this correct ? I suppose the swing arm can rotate so it isn’t knocked off if you hit some Floating debris ? [/QUOTE]
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Boat House
Anybody have one of these speedo’s ?
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