Add a Gauge to Heaters to indicate duration

Trying to remember how many hours you have before a heater runs out of fuel isn't exactly exciting or fun. Some sort of gauge that lets you know about how long you've got before it runs out of fuel would be great. Maybe a more advanced gauge would give a notice that the fuel is at less than 10 hours? Or even a fuel management system that took fuel from a container? That would give a reason to have a fuel box. Right now, I don't build fuel boxes because they just lower decoration and provide no real benefit.