Just an update on the speedometer not working problem.

I did use a small drill bit to core out some "gunk" (looked like wood) from the entry hole (as suggested by Marine4life and every Youtube DIY video I looked at) and even without uncoupling the rubber tube and blowing air thru it, the speedometer once again works !!

The woody substance that I cored out of there was likely from the motor bumping into or dragging over stumps or logs and collecting in the hole.

But, at least now I know how to quickly remedy the problem, should it arise again. Thanks ya'll !!