Hey guys, I have a 99 legacy and have been having issues with the speedos the past few years where they'll be accurate one day and then all over the board the other. I bought one of those tools where you can clean the hole in the back of the boat which didn't help at all. The gauges seem to be mechanical so I'm not sure where the tube from the back goes to. Has anyone come across this before? is it possible that the gauges are bad or would it be an issue with the tube?

Thanks in advance.