Im trying to hook up a toogle switch to my mustang so that i have to flip it then turn the key to get the car to start how do i switch this.

 

Look under dash at the ignition harness, it is coming from where you put your key in.
In that bundle of wires there will be a white/pink wire. This is your starter wire. Cut
it in half and run your switch to that wire.

 

Your gonna wana a relay to do it that way. Use a small amp switch to turn the relay on.