looking for some help with my outboard

[keepin it reel]

hello all im  hoping someone can answer a question i have about my 1989 yamaha 175 outboard  today was doing some cleaning around the transom area and noticed a small tube/hose that seemed to be broken under the motor that led to the lower unit but i couldn't see where the rest of the hose went to so my question is what does it do and where does it go ? thanks in advance

[regulator]

Possibly the water pick-up tube for the in dash speedometer. I have a 60 horse Merc, and that is the only hose visible on the motor exterior.

[keepin it reel]

thank you for your input i thought perhaps it it was for that but the boat has digital gauges abd would the speedometer hose come from the lower gear case ? 

[keepin it reel]

thanks regulator after your input i did a little more research and concluded that in fact the hose is for a speedometer must be factory installed if that type of speedometer is used thanks again tight lines to you