Yes, it has been done. Somewhere I have links to instructions. If I can find them I'll come back and edit them into this post. IIRC, there's a warning against wiping the film off the back side of the sight glass.Has anyone ever replace the face of their speedo?
We had a guy here who printed custom faces before he died. My plan was to replace the face on mine with something very basic but correct the spacing of the marks so the needle would indicate the correct speed. Never got around to it. Probably won't.
On edit:
Here's something on a CB750 speedometer. Don't know if Shadows are the same but suspect they are. Honda likes commonality/consistency. Another two links I had are dead. I *might* have something on another PC. I'll be back with that if I find it.