1995 XJ6 odometer

The odometer digital read out which also gives other information has recently started to fail in my 1995 Xj6 . I can see the top of the numbers only but the bottom of the numbers is best described as lit up so its just sort of a cloud of light rising over them. My guess is it will need replacement . Is this part available and has anyone done the procedure ? Would be nice to know the mileage if nothing else. The display above the radio is long gone too.

Found several for sale , easy to remove and replace? Anyone?