Re: speedometer help
The speedometer is driven by a pitot that is either a separate plastic unit screwed to the transom or as mentioned, it is built into the lower unit of the drive. As the boat moves through the water, water pressure compresses air in the tube and that pressure tries to unwind a Bourdon tube in the speedometer head which is linked to the needle. The more the tube unwinds the higher the needle goes. That is also why the speedometer doesn't begin to register until you reach 10 MPH or so. There just isn't enough pressure in the tube. Clean the pitot and check for a disconnected or pinched tube. The electrical connections on a speedometer are for the internal light only.