Need some advise from you wiring experts out there please. I have relocated my ballast switches to above the arm rest (see pic below) and occassionally, when someone besides me is driving, they will accidentally hit one of the switches. I would like to remedy this by using an unused switch on the dash to turn the power to the ballast switches on and off. My boat was delivered to the dealer with a Gravity I system so I have one ballast switch on the dash that is no longer being used. I would like to use this as an on off switch for the three current ballast switches. It's a 3 position switch - Empty, Off, and Fill. I would like the 3 ballast switches to be inoperable when the dash mounted switch is in the Off position and operable when the dash switch is in the Fill position.

How would I go about wiring this up?

Thanks in advance.