80 B tach removal?

I need to remove my tach but there ain't no thumbwheels. Any ideas about how to remove this thing?
tx in advance,
tom

BL changed to using 3 small notches in the opening for both the speedo and tach on the later models to hold them in.
You should be able to turn it about 30 degrees anti-clockwise and remove it.

They're often stiffer than a spinster's knees, but Mike's got the method...

anti-clock wise as looking from the front of the meter?

Yes.