Does anyone know where to find a gauge for a 100 pounder? All I find are for littler grill tanks, 20, 40 pound max. We finally rid ourselves of the big white elephant on the lawn (the BIG propane tank) and will be putting a 100 lb tank in it's place. Since we will be using this for cooking and hot water, I'd like to be able to keep an eye on it-you know, no surprises mid shower or while the cookies are baking. We'll either plumb a dual tank set up or just have a second full tank waiting in the wings so we can swap out when needed.