The improved steering controller is of the type used to control the angular position of the rear wheels on a four-wheel-steer vehicle as a function of the angular position of the front, operator-steered wheels. The controller includes a computing section, a visual display of the alpha-numeric type and a visual indicator which provides a bar-like display having a number of individual "markers" arranged in a row. The apparent length of such bar-like display, which changes as markers are illuminated, apprises the vehicle operator of the approximate magnitude and direction of angular displacement of the rear wheels from the centered position. The alpha-numeric visual display indicates operational mode as well as "errors" used in troubleshooting diagnosis and repair. The controller also incorporates a "learn" feature whereby the threshold input power and coil operating current of the steering hydraulic valve are determined and stored in a memory section to provide more consistent valve operation and to reduce setup time. Matched or proportional steering is provided.