Someone asked me how to adjust the speed correclty, so i thought I'd post e few ways to do it here for anyone else who is unsure.
A few options:
1. If you still have the old meter then connect both meters, have the e-bike with the motorised wheel lifted off the ground and apply throttle and adjust the new meter to match the old meter reading for speed.
2. If you do not have the old meter then maybe connect a good quality bicycle computer to calibrate it against and adjust it as per item 1 above.
3. connect the new meter and mount a GPS/ satnav (or use an ap on your smart phone, etc.), ride along and note the meter speed compared to the GPS. Stop and adjust the LCD meter then check again, etc.
4. This method is a bit more time consuming. Use another vehicle with a trip/odometer and map out a route by driving a set distance (a longer distance will be more acccurate, so say 5km minimum). Have the new meter connected then ride the same route you mapped out and adjust in small increments until both trip/odometers measure the same distance.