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Old 21 August 2009, 11:25   #11
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Quote:
Originally Posted by Polwart View Post
the yam gauge is measuring speed through the water (probably as estimated from the vacuum generated by dragging a tube through the water)
Actually, I think it's pressure generated by having the open end of the tube facing forwards. The opening is usually on the leading edge of the lower unit; you can find it by running a fingernail up the front edge. May be somewhat clogged as well, which will add to the discrepancy between analog and electronic meters. [Note: If the tube falls off the guage, you get water spraying around inside the console. Make sure it's firmly affixed if you like your console dry.]

There are also aftermarket pitot speed guages; they usually have a triangular plastic pickup mounted on the transom.

jky
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