I'm looking at the circuit diagram in the haynes manual for a '99 R6 and it looks like there's 2 fuses in the circuit. The main fuse (prob just after the battery) and then a back up fuse (in the fusebox). From the backup fuse there's a red wire taking power to the dash, from there it's all pcb distributing power to tacho, neutral light, oil light, and fuel light. High beam indicator is a seperate wire for power as is indicator and also the lights for the dash (one wire each). Most have a common earth apart from indicator light.
From all this I'd say open up the dash (its not too hard the worst bit is taking the nose off) and check for corrosion on the pcb as they seem to have the same power source and earth route.
Hope this helps
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