damiendada

Hey guys so I desperately need some help with this. I need an easier route to get my door trigger wire connected. I saw that there needs to be lines ran to each door to connect to the trigger but my idea is why cant I connect to the door open indicator light on the dash??? that has no delay like the dome light and its right there close by. Another thought is, am not disabling my factory alarm at all so wont my factory alarm still trigger if my door is opened and if I hit the unlock on the after market remote wont that disarm the factory alarm?