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Cable gauge size for 20' run


I am thinking of running a separate circuit to the fly bridge of my 1994 CPMY for the electronics. I would make a run from the back of the selector switch which is under the stairs, up the wire chase and under the dash panel. I would place a battery disconnect switch up there so I could effectively shut off all electrical from the electronics while they are not used. I have:
9" RAY e97
12" Ray e127
Quantum 2 Dome
Raystar 130 GPS
Evolution Auto Pilot

What sized cable would you suggest? Would a number 4 be sufficient? Or should I go to a #2?

Thanks!

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