I love using vintage lenses on the Sony cameras, adding image stabilisation to a lens that was made way before anyone could even think of such a thing - brilliant!
As the lens has no communication with the camera, you will have to input the appropriate focal length manually. I've found it best to add Steadyshot to the Fn menu for quick access. With a zoom lens you'll need to change the setting whenever you zoom, so best use it like a variable prime and preset the focal length first.
General Steadyshot information for the A6500 (see halfway down the Note for manual operation) -
https://helpguide.sony.net/ilc/1640/v1/en/contents/TP0001306081.html?search=steadyshot
Changing what is displayed in the Fn menu -
https://helpguide.sony.net/ilc/1640/v1/en/contents/TP0001273806.html
