- Choice of 2 or 5 Degree Markings - Large 6" Dial Diameter - Easily Installed, Fits 7 1/4" (18.42 cm) Mounting Hole. Click here to view a template of the mounting hole (NOTE: Be sure you print the template full size). - PowerDamp Performance Dials - 90 degree Lubber Lines for Easy Reading - Full Internal Gimbals - 12 Volt Green NiteVu Lighting - Optional Night Lighting Available in 24 or 32 Volts - Spherical Design with Fiberglass Reinforced Bowl - High-Capacity Roller Diaphragm for Extended Temperature Operating Ranges - 100% Repairable - Exclusive 5-Year Ritchie Warranty