instrument lighting wiring and fuse

3 amp fuse is almost for sure to protect the printed circuit board. Looking at diagram, light switch supplies power to circuit E1-18 0 to hot side of 3 amp fuse. There are two branches off that 3 amp fuse. E2A-18 0 goes to printed circuit board instrument lamps ,E2-18 0 to console . leave those two circuits alone. Instead with a separate inline fuse Tap into circuit E1-18 O, hot side of the fuse from light switch. In my opinion a safer way to do this