I have just bought a new speedo face for my NC35, it shows MPH as well as KMP/H. Can somebody please tell me which is the best way to fit the new face?

I heard you should remove the speedo needle with a fork. Then when the speedo unit is connected to the wiring it will reset the needle, if it doesn't reset to 0, the needle has to be moved until it is in the right position?

Does anybody know if this is the right procedure for an NC35?