Speedometer not working

[Bduck]

Roger, do I detect the terminology of a past aircraft mechanic ?  Pitot tube ? (was an AF aircraft electrician for 20 years)  Or is that what it is also called on the boat motor?    

Forrest, not to be in denial yes the lingo follows one after 38yrs of using it or you can call it brain washing. However, I will be continuing to use it as you have also understood the lingo too. It is also used in the boating world as an example in the link I posted here. To further go one step into the lingo the term tech data is everyday talk but we also call it searching a TO.    You also have a quality skill as an electrician that is very useful in many areas outside the AF especially in the rigging of certain boat accessories.   
https://www.wholesalemarine.com/sea-dog-...-tube.html