A lot of folks like to use a silver "Paint Pen" by Testors, available at most hobby shops and/or Wal Mart. Still others have suggested having the entire bezel replated and then paint the black areas (beautiful but expensive). I know of one individual who applied chrome leaf with pretty good results. Not sure how durable that is though. Silver paint pen seems to be the method of choice.
Patrick, aka Merlin
1968 SS 396/325 4-Speed, White with black vinyl top & black interior.