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OBC display problems are relatively common. Unfortunately it isn't usually an "easy fix". Firstly if the display itself is flickering on and off, it isn't going to be a blown bulb (that would have been relatively straight forward).
The issue is more likely to be an failing transisters on the printed circuit board at the back of the tacho. Other forums (such as Rennlist) have posted extensive write ups on how to fix these, but I think a reasonable handle on electronics would be of benefit. Getting the tacho out is also a bit of a phaff - generally the steering wheel needs to be removed as the tacho with an obc is deeper than the non-obc verson and there isn't enough clearance with the wheel in place (although some owners seemed to have managed it apparently). Pop the clock out first as this is the easiest instrument to remove and you will be able to then push the tacho from behind - ribbed rubber gaskets make the instruments a snug fit. Work the clock out slowly with a wide blade screwdriver - be carefull as you don't want to break the instrument bezel or glass, or damage the dash (particularly if you have a leather dash). You will need to disconnect the battery half an hour before starting as a precaution against the airbag going off in your face when you get to the point of removing the wheel. Then undo two torx bolts at the back of the wheel to release the air bag cover and remove the airbag to expose the nut in the centre of the wheel. If you need to get the steering column shroud off as well, that's just a screw either side and a bit of a fiddle (mainly a fiddle to put back as the rubber grommits around the indicator and wiper stalks takes a bit of alignment).
My OBC digits are working, but the backlight isn't which means I can't see mine at night or in bright sunlight. The problem with mine is a burnt power track on the pcb so that will need to be by-passed......by a specialist, not me.
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