Davis Rudder Position Indicator Davis' Rudder Position Indicator Gives Instant Visual Reference Of Rudder Angle. Mounts Directly To Your Hub (Approximately 2" (5 Cm) In Diameter) With A Self-Adhesive Pad. Suitable For Boats With Mechanical And Single Station Hydraulic Steering Systems. Box Dimensions: 8"Lx5"Wx1"H. Weight: 0.1 lbs.