The ones on the trucks housed in the bay where I work are tank water level..... that's not to say they aren't for something else on other trucks.shues said:I agree. I've seen a few trucks at FDIC with lights just like those that were specifically for tank water level. However, perhaps the specific purpose of those lights varies from region to region.
Tank Level guages - Firehouse Forums - Firefighting Discussion
Multi-colored lights on cab - Firehouse Forums - Firefighting Discussion