Review on High-Performance Marshall Instruments LBB00015 Fuel Pressure Gauge in Sleek Black Design by Richard Cunningham

This came with no instructions. It was written on the gauge that the vinyl fitting had to be cut to equalize the pressure in the gauge. It should be at the top of the display but I rotated it 45 degrees and the silicone oil came out. Marshall answered my question and said that it works great with no oil and that the oil stops flowing once it's gone. reaches a level below the nipple. In any case, the sensor works perfectly and looks good. Just make sure it's pointing up, parallel to the floor. It can even work without cutting the nipple. I imagine a lot of people don't try to follow the label on the gauge.