1/4 or 1/2 should work, hole saw for the guages, though never used one on starboard myself. You'll be glad you went with the blue seas switch panel, though you can get them with fuses or circuit breakers included, saves another link in the system and less wire crimps, heat shrinks, etc.
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1985 Wellcraft V-20, Evinrude ETEC 150: SOLD
1979 Marine Trader 44, twin Ford Lehman 120s
2006 Panga 14, Tohatsu 20
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