KC, I helped a friend set up a kerosene tank for his home heater. Heater was vented, and it was normal kerosene, not the stuff they only sell for heaters these days. My friend got about a 5 gallon vertical tank. We make a stand to set up on the opposite side of his front room wall. For some reason, this tank had a 90 degree nipple fitting about an inch from the top of the tank and another same fitting about an inch above the bottom of the tank. I got some thick clear gas line, some stainless clamps, and fit hose to top and bottom nipple in a straight line, clamping them in place. Now he had a "sight tube" to check how much kerosene was in the tank from his front room window. Long time ago, but I think it was 1979 when this sight tube was put in place.
DAVE--you're doing my hammered copper nuvincii build.