Hey all im not really that familiar when it comes to the electrical part of cars. Well this is what im trying to do, I already have an existing toggle switch for my nitrous but I want to use another toggle and install a LED at the same time so when I switch it on the LED turns on and when its off the LED turns off. I want to use a 3 prong toggle switch, so how will I go about doing this. thanks in advance. Also I have no idea with section of the forum to post this on so I figured here.

 

Why use another switch at all? You can just splice the power wire from your nitrous switch and wind in the positive wire from the LED onto that wire and ground the negative wire and they'll both turn on and off at the same time.