1. Depends, if you're pulling up the floor to add a new hose then use the floor channel. The easiest is to run the wires in the wiring chase, along the drivers side. If you look towards the rear from underneath the helm near the sidewall you'll see what I'm talking about. Just follow the existing wires and ziptie them out of the way.

2. Each pump uses 15-20 amp on startup, the OEM system can't handle that. You need to install a new fuse block, depending on where you batteries is/are this can be easy/hard. You may already have a separate fuse box under the helm, it should have a large 10 gauge or so supply. I had to run a 10 gauge wire from my battery in the storage area under the floor into the helm. My second boat this was already there..

Fuse block, fuse holder, fuse.
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

My older setup:
https://forum.moomba.com/showthread....hlight=ballast

3. Buy breakers instead of fuses, these reset after they cool, otherwise you'll be replacing fuses all the time. The fuse box cover doesn't fit with the breaker.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

4. Switch location, I moved the key start to the other side and used that are for the ballast switches.
https://forum.moomba.com/showthread....hlight=ballast