Download LiteratureRitchie Compass X-21BB CompassRitchieSport CompassRitchieSport Compass Features 2" (5.08cm) Direct Reading Dial Easily Installed, Fits Standard 2-1/16" Instrument Hole View Adusts up to 30 degrees Scientifically Matched Sapphire Jewel & Hardened Steel Pivot Dial Movement Exclusive Built-in Green NiteVu Lighting High Temperature Composite Construction for Extended Operating Range DirectiveForce Magnets Exclusive 5-Year Ritchie Warranty Approx. Shipping Weight: 5oz (142g)Notes: X-21 Compasses do not have Built-in Compensators.Comes standard with 12V lighting. Some custom built OEM models may have different lighting. Contact Ritchie for replacement lighting. Specifications:Lubber Lines = NONE Mounting Style = Dash Read = NONE Backlight = YesRITCHIE X-21BB DASH MOUNT COMPASS, BLACK/BLACKNormalized SKU: X21BBUPC Code: 010342170767Ritchie Compass X-21BB Literature Download Quick Reference Guide Owners Manual