Hi and welcome to the forum
Is it just one light that flickered? (bulb is on its way out),
not an easy job taking dash out to replace one bulb after it blows.
Or all dash background lights flickered? (the 12V supply to the dash lights is suspect)
Does it flicker with car movement, ie, going over bumps or potholes in the road?
This could be a dodgy fuse, not solidly in place in fuse box, push fuse in better, or replace with another same rated fuse.
or could be a bad connector or (plug/socket) in the wiring to the dash that is disconnecting with car movement , inspect these, make sure they are pushed solidly home. Use a 12V meter to check electrical continuity, ie, 12V to the dash lights.