I dont use a manufactured switch panel. I made mine and use relays to power water pump, fan, fuel pump,etc. This switch kills all power at my terminal strip. It kills power to everything when i hit it. I also have a seperate ignition switch so i can turn the motor over then flip ignition on after motor is turning over. The kill switch is mounted just in front of my shifter.
You could use it in line to cut power off / on to a switch panel very easy. I dont like having to fumble around in an emergeny situation trying to find a small kill switch thats mounted in a switch panel.