I've tried to take the tube off the speedo but can't get my hand in at a good angle to remove it. There's a hole in the dash for another gauge and I can take that out, but can't manipulate in that space. That's why I wanted to try from the dampers. Will be getting the boat hme the end of this week from storage and I'll try it. What air pressure do you use? Don't want to fail a line.
The boat only has one speedo. Really would like it working perfectly again.
Thanks for your help. Will keep you posted.