I bought one from Murle. I had to bore out the orifice and rethread the tank from Kitfox in order for it to fit. On the tanks Murle fabricates he builds them to use the blue unit he sells. I bought a high output LED light at O'Reilly auto and put it on the dash in a prominent location. I tested it by shutting the auxiliary fuel valves and letting the engine run the header tank down. When the light came on it was very bright. I then opened the auxiliary valves and let the header tank fill back up and the light went out. Subsequently, I was taxiing one day and decided to turn around and go the opposite direction. I applied hard right brake and spun it around and I noticed that the light came on momentarily as the centrifugal force sloshed the fuel all to the right side. It went out as soon as the plane was moving in the new direction. The brightness of the light is very eye catching.