The STM In-Line Fuel Pressure Gauge features a -8AN adapter for a clean and simple install. Comes fully assembled with PTFE tape. The fittings is black anodized, safe for use with gasoline, E85 and race gas. The Fuel Pressure Gauge is silicone-filled for vibration dampening and sealed in a rugged, stainless steel case. Accurately reads fuel pressure from 0-100 psi.