I got a 2000 Lincoln ls and inside rear view mirror does not auto dim. There is a brown oval that goes accross the whole mirror. I wanted to replace the mirror but I would like to put one in that has the compass. Have any of you guys upgraded the mirror to one that does have the compass? If so which year LS would I use to upgrade, 02,03, 04, etc? And what would I need to do to existing to make the new mirror work?