Sandman,
Don't let this scare you, if you are handy it really isn't a big deal.
I installed a similar ducer as Ronnies, just a bit shorter maybe a 15" B744.
I used epoxied plywood as a backer, my location was a zero deadrise spot on a stiffner rake.
Is is important to dryfit this together and actually put everything in the hole including the paddle wheel if you have a speed transducer too. Short story......I have everything ready to go and fit it, then found out shortly after that my speed attachment wouldn't bottom out and seal for the backer block was too thick. So picture wet 5200 on everything snaking cable thru nuts and everything to take this apart to install a thinner block. Yeah it was a bit messy to say the least and just a few cuss words......
As for ducers with the speed paddle wheel I wouldn't bother spending the extra money for this thru the water data. You really don't use it and is just approximate anyway.. Just another thing to maybe go wrong in the bilge.
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