Electric start wire gauges?

[72pleasurecraft]

I’m adding electric start to my 1972 Evinrude 25hp. I have the starter and bracket and the solenoid. My question is what gauge wires do I need?

 

[hardwater fisherman]

The wiring diagram for my 1976 40hp calls for 6 gauge from solenoid to starter . 6 gauge for battery cables.. 16 gauge for the rest. Should be similar for your motor. EDIT The fused wire from key switch/push button is 12 gauge with a 20 amp fuse.