I think there is, like I suspect, something similar to what's inside cameras around the sensor.
To eliminate confusion for anyone, this is not on the back side of the transparent plastic protective cover, but on the black face that is underneath it, the one that creates a nice frame around each gauge.
1982 Kawasaki KZ1300 A4
1981 Kawasaki KZ1300 A3
assembling engine, chassis & electrical from 79 - 89 parts