Wiring diagram for an Erider B2000?

Hey all. Does anyone have the wiring diagram for an Erider B2000? It's a 2016 model. Having issues with the Speedometer. Both the Speedo and tachometer aren't working. Just displaying all zeros. The seller told me it was like that when they got it but now it needs an MOT and I know it won't pass with no speedometer.

Any help would be appreciated ☺️

have you checked all the plugs and sockets on wires from the controller? look out for removed pins or pins bent to not connect properly. treat any corrosion with deoxit.

For a wiring guide google for the controller model number, but they are all generally the same 2-3 wire inputs for brake sensors 3 wire inputs from throttle , upto 5-6 wire cable to the headset/display and 3 heavy guage wires plus some sensor wires in most cases leading off to the motor and 2 x 2 wire outputs for lights (afaik indicators will have a discrete flasher unit?)