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Looking for a "Keyed" power source

I'm trying to install a Garmin fish finder on my Sweetwater pontoon boat.  Model year 2015, 70 HP Yamaha, 20' long.  I've pulled the dash apart looking for a power source to tap into.  I'd like a power source that is only "hot" when the key is turned on.  So far, everything I've tried is always hot.  Does a keyed power source exist on this boat?  Thank you!