78 Camaro Speedometer Cable/T-Tops

Hi,

Couple questions on a 1978 Camaro Z28 I just bought to restore:

1) The car needs the speedo cable replaced. Anybody have instructions on that?

2) The T-tops are not factory original, looks like the center roof piece that separated the originals was removed because the T-tops meet in the center. Should I attempt to restore the middle piece/original T-tops, or is it not worth it?

Thanks for any advice/instructions!