need advise

[keepitgreen05]

i have a 87 steplift with a few problems i want to rewire it as it is like a rats nest under the panel. also i have a 87 johnson 140 vro on it i took it to the shop and they said i fouled the plugs and some silioned was bad 900.00 later i brought it home and the lilt is now working the battery gauge goes down when i hit the button but nothing happens. now i have a motor that i don't even know if it was fixed and a boat that needs to be rewired and suggestion also i want to run the plumbing to make the fish box in the middle of the boat a live well and install a sounder/gps and suggestion