There is something nostalgic about these old black and white fish finders.  In some ways they are outdated, but still very useful and efficient at what they do if you can find one of the later models. On the other hand, I also have a few old flasher units laying around as well as what was my folks wall mounted rotary phone, all still operable, but I wouldn't want to have to use either of them.   :D

I am glad some have found the ball mounts useful.  It is definitely a niche item.

HighNDry, I may have a solution for you if you are willing to be a beta tester.  I have an old Humminbird Piranha model 2, circa 2004 that I used to use with AA batteries.  I modeled a ball mount adapter for it which may or may not fit your P175 unit.  It is a simpler design as Humminbird basically uses a small gimble bracket with two screws to tighten the screen to the base.  My design fits over the bracket and secures with a 10-24 bolt, then there is a 1/4 inch bolt going through the balll and a lock nut as in my other design. 
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I can help you out with the power connection too, as it was a project I was working on already.   I have a 3 piece 3D printed two pin power plug that I designed.  I have a Helix unit that I got with a boat I purchased, and I was surprised it used the exact same power plug as my old Piranha unit.  I have been trying to incorporate these 5.5mm quick disconnect plugs on my units as they work quite well.  These connections are commonly used for low voltage LED lighting applications, so they are quite common and you can get extensions in a variety of increments.  The plugs aren't submersible waterproof, but I try not to operate in submarine mode and they have been fine out in the rain.

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Here is my 3D printed Lowrance Power plug for comparison.  This won't fit the B&W units such as the X-4 or Cuda units, as they use a different molded connector integrated with the transducer.  The newer Hook2 and Hook Reveal units also use a different molded push in connector. 

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