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Author Topic:   Speedometer
boatdryver posted 09-22-2006 05:20 PM ET (US)   Profile for boatdryver   Send Email to boatdryver  
On my 1979 Montauk with a newer Honda BF 90 motor and tachometer, there is an old speedometer which registers something close to accurate speed compared to the new GPS.

However, there is no paddlewheel or other in-the-water-sensor.Where is this unit getting its information? Is it using tach data and computing speed not knowing the prop size or what?


jimh posted 09-22-2006 05:23 PM ET (US)     Profile for jimh  Send Email to jimh     
Inspect the speedometer instrument to learn more about its principle of operation. Does it have a hose connected to it which leads to the engine? Or does it have wires connected to it? Disregard wires associated with an illumination circuit.
jim40 posted 09-22-2006 05:44 PM ET (US)     Profile for jim40  Send Email to jim40     
I had a 200 hp merc. that had the speedo pickup on the foot of the motor. If this is the case, look down low on the foot of the motor to see if thats where it is. Hope this helps.

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