FYI Update: The early clusters had some kind of printed circuitry on the back of the plastic housing like yours. Later in 64 they went to a flex print which is protected by/encapsulated in polymer sheets and does not have that black coating. Much better, So if you ever decide to replace, use a 64 and up donor housing and flex print interconnect. Uses the same connector. See pic of 64-66 type.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn