If your speedometer is not working, a good chance the intake hole is plugged up. I read that many times, but unfortunately, I could not easily find a Boat Talk post that showed EXACTLY where the intake hole was on my 236 SSX. Thankfully, after much searching, I found the answer. Shepherd (I think), posted a picture showing exactly where the hole is. It was a few years ago, but in hopes of helping someone else I am "reposting", and added a few topic tags. Finally, fixed, all good. I used an eyeglass screwdriver to unplug. Again, just thought I would "Pass it On"! Thanks!!!