I have a carb 0-360 on a RV-7A with a red cube installed in the fuel line displaying on a 3500S. The red cube is installed suspended in the incoming fuel line to the carb. 600+ hours with no problems and is reasonable accurate. (.5 gal on fill up). I belive hard mounting thses cubes leads to an early failure. My opinion only...
I'm happy with it.....
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