[The Bus Crew]

First off, thank you for any help. I have attached some pictures of my propane heat system and the box with the red light which I am not sure weather or not it is part of the propane heat or not. Overall I have no idea how to turn these heaters on or lite the pilot light. I see 2 of the 3 units have a sight glass where I assume I should see the pilot light. So any Idea how to turn these on would be appreciated.