Explorer Compass Features 2 3/4" Easy to Read Direct Reading Dial Easily Installed, Fits 3.75" (9.53 cm) Mounting Hole. Click here to view a template of the mounting hole (NOTE: Adobe versions may differ; download and print the template Actual size). Internal Green Night Illumination Built-in Compensators to Easily Adjust for Deviation Scientifically Matched Sapphire Jewel & Hardened Steel Pivot Dial Movement Powerful DirectiveForce Magnets for Fast Heading Lock-on Movable Sun Shield High Temperature Composite Construction for Extended Operating Range 100% Repairable Exclusive 5-Year Ritchie Warranty Protective Cover: E-50- C Replacement Lighting: 6 Volt: EX-0099- 2 12 Volt: EX- 0005-2 24 Volt: EX- 0098 12 Volt Light & Wire Assembly: EX-0022 ASY Mounting Gasket: EX-0039 Notes: Comes standard with 12 volt lighting. 6 & 24 volt lighting options are available. Some custom built OEM models may have different lighting. Contact Ritchie for replacement lighting.