These shock-proof liquid filled gauges are vibration resistant to monitor your oil pressure with extreme accuracy! Gauge: Rugged gauge case is constructed of stainless steel with brass internals. Silicone filled for vibration dampening with a durable acrylic lens. 1-3/4” Gauge Face (including bezel). 0-60 psi 1/8” NPT rear connection. Black gauge face with a polished Stainless Steel bezel. Adapter Kit: Chrome plated to look good for years to come. Female 1/8" NPT threads. Works with our Marshall AND Accel Oil Pressure Gauges. MADE IN THE USA Fits 1970 - Later Harley Big Twin, Shovelhead, and Evolution Motors (Replaces the top end feed screen plug on the engine block.) Finish: Gauge Face – Machine Turned Style Polished Stainless Steel Bezel Dimensions: Gauge face (w/ bezel) - 1.75” Gauge Case - 1.6” Depth - 1” Fitment: Fits 1970 - Later Harley Big Twin, Shovelhead, and Evolution Motors (Replaces the top end feed screen plug on the engine block.)