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Need Wiring Diagram for my 2008 SD237 (with 225 OB)

I need a wiring diagram for my 2008 SD237 with 225 OB.  I'm trying to upgrade my sonar unit and need to know the wire gauge of the power wiring running from the cranking battery to the Master Switch.  Also, looking to understand the wiring of the Accessory Switches to best connect power to the sonar unit.
Appreciate any help that can be provided!

Answers