Speedo reading too fast

Night swimmer

New Member
Apr 17, 2014
59
Lakes region NH
Boat Info
2006 sea ray 240 sundeck,
Engines
350 mag mpi
My speedo was reading just fine last year but this year it's reading too fast. I have 2 gps in the boat and they read the same but the factory guage along with the smartcraft guage is reading about 15 mph too fast. Does anybody know what would cause this?

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Who knows? But I would definitely calculate fuel economy from the speedo from now on.
 
It is great showing friends the boat does 60 to 65.

Mike I get much better aerodynamics with such a small suit on lol

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