i was out monday and there was a lot o chit in the water and speeding along at the last second i see a large beam , with no time to turn i at least get the boat out of gear before the bang , i could not find any damage other than a gouge in the hull but since hitting this my speedodometer has not worked . it is a 115 yamaha 4 stroke with yamaha gauges , anyone have any thoughts ?

So the speedo reads from the engine, not the transducer?

Is there a water tube to the gauge?

there's a tiny little pin hole {like 1/64'th inch} in the leading edge of the lower unit under the cavitation plate. take a small drill bit and twist in in there, Bye hand. to clean out the hole.

there's a tiny little pin hole {like 1/64'th inch} in the leading edge of the lower unit under the cavitation plate. take a small drill bit and twist in in there, Bye hand. to clean out the hole.

Ahhh, so its a water pressure type.

Is there a tube running to the gauge, or does a sensor take over and send an electronic signal to the gauge?

I had the remote water pressure type, tore that out the second day I owned my boat. GPS is so much better and accurate.

tube all the way to the gauge. they don't last very long and aren't very accurate.

Ahhh, so its a water pressure type.

Is there a tube running to the gauge, or does a sensor take over and send an electronic signal to the gauge?

I had the remote water pressure type, tore that out the second day I owned my boat. GPS is so much better and accurate.

Ditto. Go with the GPS speed. I pay a lot more attention to my RPMs than the speed. I know I'm doing between 23 and 25 knots at 4200 RPMs.