thanks for info. mystery continues!From my 70 parts book, 2984764 is listed as "Cover instrument panel clock hole" it is listed as fitting 1970 Belvedere and Coronet.
There is nothing like that showing for an E body.
Maybe the original tach quit working and the previous owner found the cover at a junk yard?
From your pictures, I don't see the clock or speedo reset knobs, maybe that's a sign that it's been apart before.
i will check. thanksIs there a factory wire harness plug in for a tach under the dash?
you are probably correct sir. just weird someone would remove a working or nonworking and have know how about blank. Cant locate original owner even after expensive title searches!!What's the mystery? PO installed a B body blockoff in his E body.