I have searched the forum and read most of the speedo posts and done the clean out of the hole at the bottom of the drive without success. Air blown on back of gauge shows it works. Tried blowing air down line from gauge back, but no air comes out of line at the connection to the lower unit (its a bravo 3 and i disconnected it when blowing air to see if I can isolate problem). When the line was disconnected from inside the transom, water began flowing in so I assume that the line is ok from the transom back through the drive and out the pick up.
One more thing, yesterday the speedo began working then quit again with the needle on the 10 mark. How can it work and then quit again if its just an air line?
One more thing, yesterday the speedo began working then quit again with the needle on the 10 mark. How can it work and then quit again if its just an air line?