How do I wire a low voltage circuit to light an LED when one or both of my Garage doors are open?

I want to create a circuit using a couple of magnetic door sensors similar those in standard alarms. Using a simple plug in transformer in the garage, I want to illuminate a small indicator light inside the house when one or both doors are left open. Not sure of exactly how to wire this and what type of indicator... show more I want to create a circuit using a couple of magnetic door sensors similar those in standard alarms. Using a simple plug in transformer in the garage, I want to illuminate a small indicator light inside the house when one or both doors are left open. Not sure of exactly how to wire this and what type of indicator lamp to use.
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