Tommy Boy

Hi I just joined this forum today and I though this might be a good place to get some good information. I am going to be putting on a Magnacharger on my 2006 Mustang and the gauges that I have to go with it is an Autometer Boost/Vac (6159 model number) and in the directions it says to wire it directly to a hot wire so that when you turn the key on it stays hot when you go to start the car, not like the radio that will stop playing for a second or two while the starter is running... Does anyone out there know what color wire on the ignigition this would be or what I could tap into that would have constant power.. any help would be great.