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Thanks all! I checked with A mechanic and he said if I didnt use the speedo I Gould just leave it unhooked and tidy up the hose.. Since My helix 10 is slightly more accurate I just chose to leave...

I cant find anything anywhere in the cowl.. any chance that this could go into the lower unit somewhere?

Thanks I will give it A look..

I just bought this boat three weeks ago.. got home from the lake and this was dangling down.. Looks like some sort of vacuum line but goes thru the hull along with throttle cables . I have looked...