2016 and Earlier RT Models - Your Steering wheel should have 6 screws that hold it in place. A 2 1/2" Steering Wheel spacer will be required for this mount system, which can be purchased here.
2017 + RT Models - Ranger changed the steering wheel to a 1 piece Steering Wheel/ Cog. If yours boat has Hydraulic Steering, then your steering wheel should measure from the dash to the inside top edge of steering wheel, it should read about 6 3/8 - 6 5/8", If that is the case, then no spacer should be needed in most cases. If it is 4" on that measurement, then you will need a complete changeover kit to be able to add a spacer to increase area between steering wheel and unit. Steering Wheel Changeover Kit can be purchased here.