Thanks for the lead.
@Judge has a good documented install. I'm still in planning mode. My boat is wrapped for the winter. I'm most anxious about the power supply . I suspect the 27' and 25' have the same guts under the dash. I've also considered an install on the passenger side. Maybe I can tie into the light in the head.
I did try the search function. I usually get good results but on this my skills failed me. I found lots of transducer locations and methods (great info), not a lot of power tie-ins, and not a lot of wire routing. Especially for the 25' models. There was a bit for the FSH, hence my "(not FSH)" specific request.
Sadly, I violated every one of your recommendations. You will be disappointed in my unit selection, Striker 4cv. A creature of habit I tend to dip my toe first. I'll make sure to give you an "I told you" opportunity when I upgrade.