SIP 2.0 Speedo - External Speed Sensor not working

Recently purchase SIP 2.0 speedo with external sensor magnet and bracket. Wired up speedo to headset brown live (12v AC), and earthed - fitted resistor plug and cap. Speedo lights up and keeps settings, have set to EXT, entered circumference of tyre and no pulses to 1 for the attached magnet. The external sensor is not displaying speed when moving - I get a code r9 r displayed when I start the scooter up (GP 225 Rapido). Is this an error code? Do I need to replace sensor or speedo?

Hi there

did you get this working. Can you advise what yo did please?