My uncle says that the first thing he has to do if pulled over is tell the officer he has a license and whether he is armed.
http://michigan.gov/msp/1,1607,7-123-1591_3503_4654-10941--,00.html
I was referring to the "tell them where your gun is physically part". You are required by law to inform the officer that you are armed and have a CCW however.