These shock-proof liquid filled gauges are vibration resistant to monitor your oil pressure with extreme accuracy! Rocker Box Mounting Kits come with all of the necessary lines and fittings to bolt an oil gauge to a 1984-1999 Big Twin "EVO" Motor. 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. Rocker Box Mounting Kit: Mounts your oil gauge to your Rocker Box for easy visibility. 1/8” NPT male and female fittings. All lines and fittings are made of Steel. The Polished Stainless Steel Rocker Box Mounting Plate features a rubber grommet to help with vibrations and visibility. Fitment: 1984-1999 Harley Big Twin "EVO" Evolution Motors. FXST/FLST 1984-1999 FLT/FLHT 1984-1999 FXR 1984-1999 FXD 1984-1999 These shock-proof liquid filled gauges are vibration resistant to monitor your oil pressure with extreme accuracy! Rocker Box Mounting Kits come with all of the necessary lines and fittings to bolt an oil gauge to a 1984-1999 Big Twin "EVO" Motor. 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. Beautiful “Machined” style gauge face with a polished Stainless Steel bezel. Also available with a "Carbon Fiber” style face. '84-'99 EVO Rocker Box Mounting Kit: Mounts your oil gauge to your Rocker Box for easy visibility. 1/8” NPT male and female fittings. Comes all of the appropriate Lines and Fittings to bolt on to an '84-'99 Harley Evolution Motor (Rocker Box Mount.) All lines and fittings are made of Steel. The Polished Stainless Steel Rocker Box Mounting Plate features a rubber grommet to help with vibrations and visibility. Finish: Gauge Face – Machine Turned Style Polished Stainless Steel Bezel Dimensions: Gauge: Gauge face (w/ bezel) - 1.75” Gauge Case - 1.6” Depth - 1” KIT: Length of Line - 12" Fitment: 1984-1999 Harley Big Twin "EVO" Evolution Motors. FXST 1984-1999 FLST 1984-1999 FLT 1984-1999 FXR 1984-1999 FXD 1984-1999