The two issues are unlikely to be related
The “dancing speedo” is an indication of the cable about to give out – recommend you replace the entire cable, rather than just the “inner” – be careful to keep any kinks out of it, it’ll last a lot longer that way (the dealership may have messed up on the cable routing)
The clutch issue – “drag” with the engine off is usually indicative of “heavy oil”, either the wrong type, or the wrong viscosity. That the clutch functions without fault when the engine is running shows that the issue is relatively minor, so I would first go for the type of oil as the cause.
I have no idea of heat conditions in your area, but try 40w synthetic as a starting point, make sure it’s intended for wet multi-plate (motorcycle) clutches. Expect it to take a few miles before you see a difference …..