Speedo bouncing??

I had my car out on the weekend and noticed the speedo was bouncing around a bit, Only happened above 80K. It doesn’t bounce a whole lot only 2 or 3km but its slightly annoying. Is this the sign that my speed sensor is on its way out?

I did have to jump my car to get it going from sitting. I don’t think its electircal though because my voltage was solid at 14V and I had no other issues.

Thoughts?