Re: Is this pro wiring?
That is a bit of an eyesore... it'll need covering up even after a tidy re-do.
I'd expect the engine install to include any and everything that gets you to the point of firing it up and leaving the dock.. so the whole enchilada, unless unusual arrangements were made at the time.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)