Factory 69 Cuda Tach needle came off - easy reinstall?

Hi.
While sorting out an oil gauge issue, we
took the time to "'refinish" the dash surround.
It looks much better than before.
Also painted the gauge needles neon orange, tach needle came off during this process, but I think I got it back in place.

Maybe not.
all is reinstalled, tach seems wired correctly, but no needle deflection during engine run.
When I reinstalled the needle it seems to press in place with no issue.
The mounting pin on the needle seemed to pass through a small gasket / o ring during insertion.

Have you ever done this?
Any ideas on what I may have missed?

Thank you

Craig