Radium Fuel Pressure Gauge with 6AN Inline Adapter Universal Fuel Pressure Gauge (20-0152) by Radium. This high-accuracy fuel pressure gauge is suitable for all fueling applications. It features an acrylic lens with a silicone filled dial that reads from 0 to 100psi (0 to 6.9 BAR) with +/- 2% accuracy. Silicone fluid prevents the needle from vibrating for easy pressure readings. The internal bubble is normal. Comes with -6AN Adapter.