The easiest way is a stick-on digital clock available at some auto parts stores. jag-lovers.org forum search feature has posts and replies about this subject. Had no luck with search on this forum. Seems there is a electrical ribbon that supplies power to the back of the Jag clock that loses a good connection and this can be fixed by applying something like a card to put pressure on the ribbon connection. I read the procedure about getting to the clock and making this repair but can't come up with it now. Maybe some other member can be of more help.

Doug