instrument lighting wiring and fuse

Well I made a 300mile trip last weekend to a car show at the beach. It rained all the way down, so lights on all the time and no blown fuse!!!!!!
Thanks to all for information and suggestions.

I am curious about one thing. Several of the other fuses are 20 amp (marked right on the fuse box). If you look at the wiring diagram in post #8, they have 14 ga wires on the "hot" side and 18 ga wires on the other (protected) side of the fuse. According to the chart in another post this shouldn't be right. I'm not an electrical expert but am trying to learn - can anybody explain this to me? I get that the 3 amp fuse is to protect the circuit board on the back of the cluster. I'm just trying to be better informed for the next project.