BDR Speedometer Calibration

[lomdel]

Travelling at 120kmh, my factory Backdraft speedo (kmh) indicates 120kmh while the actual GPS speed is actually just 104kmh. How do I re-calibrate the speedo to be a bit more accurate? Below is the instructions as received from the factory, but I don't understand. Where is the button (nothing on the face)? What should pulse number setting be? Any tips?

1/ Turn Ignition On
2/ Hold button down To Increase Pulse Settings at the Rear End
3/ Wait for numbers to flash - press button until desired numbers are displayed
4/ When Pressing down, it Either Goes up Or Down depending on Required Pulse Setting
5/ Once Desired Setting is Set let the Button Go and it will Register

[Kobura]

Have you tried to get help from the BDR factory folks in Durban?

[lomdel]

Yes thanks, John Scott of Backdraft emailed me some more info. The button is at the back of the speedo.