Marco, DOD and Boss uses "normally open" swiches. It works like this the switches has 2 poles. Let's say you remove the switch, you are left with 2 lines. When you tap the lines together it switches on. Tap the lines again it switches off. Now a 3pdt switch will not work directly as a bolt on solder, you may need to rewire. And of course a bigger casing will be needed.
Normally open switches are available at Alexan. They may not look identical with your DOD switch but it will work. Price is just 17 petot!