It is best to use a hair dryer. thumbs
A friend of mine with a 2001 4-4 had to go for a technical inspection (french MOT) and his VDO indicator only worked occasionally, if at all. He was saved by using a hair dryer regularly for a few days before his MOT.
Otherwise you can change the LCD display screen on these VDO meters, they are all the same and made in China of course. They cost less than 20 pounds on Aliexpress. A guy did it here in France with success, as a precaution I ordered one in advance for the day mine breaks down. Here is the link : VDO tacho LCD

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Happy Morgan +8 (2001) owner
BMW 435i - X Drive
Royal Enfield 500 EFI
Royal Enfield 650 Interceptor