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Sgt,
I the wiring looks like decent quality with no extra connections between pump and panel there is no reason to replace good wiring. No you don't "have" to use "marine" wiring either. That just adds another 50cents a foot on the job. Good quailty cooper control wire is fine.. Most important is when you butt connect fittings...and the pump you have is most likely butt connected in... shrink tube over the connections with good tubing that has sealing adhesive inside, it won't fail. And like Likwid said leave a loop, in the industry this is called a "service loop", most "professional" places fail to do this leaving the repair much harder.
Oh, and yes it is a good idea tl have to manual pump too just in case.
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