The flickering on the dash is usually poor earth or connection.
Each time it is removed and put back is an opportunity for captain cockup to dine as it is a very tight squeeze for the poor mechanic.

The small LCD display can also get a bit fuzzy due to low voltage on occasion from my experience. Always make certain earth strap on the battery is good and tight to the body, this can also be seen by poor starting (tick, tick)

Everyone loves a Morgan. Even me, unless it's broken again.