Heads Up Indicators are recognized as the most accurate in the marine industry with an inherent accuracy of a few thousandths of an inch. The Indicator sticks move up and down with the outboard, drives, trim tabs, jackplate and tunnel flaps. Each system includes the following: Deluxe Heads Up Indicator Spring Assemblies, Deluxe Heads-Up Indicator Slide Assemblies, Deluxe Heads-Up Thumb wheel Adjusting Knobs.