Yes, it is possible to calibrate the RAA100 to accept non-standard resistive sensors or to set custom hard over angles using Maretron's DSM150, DSM200, or DSM250 display. Set the mode using Maretron's DSM150, DSM200, or DSM250 display in the following way. Enter menu mode, scroll to "Configuration…" and press enter. Scroll to "Device Configuration…" and press enter. Scroll to the row containing the RAA100 and press enter. Scroll to "Rudder Angel Calibration:" and press enter. Scroll until you find "Custom Calibration..." and press enter. Follow the instructions on the screen to perform custom calibration.