Hi MH, Do not know what that site is.There should be tons of info on this forum regarding the polarity switch.Assuming you have an unmolested BJ8 I will list the tasks that must be done. Wires on coil must be reversed,Cenerator must be repolarised, Battery leads must be reversed or Batt turned around, Tachometer must be modified internally,Pickup loop on back of Tach must be reversed,Radio if positive Gnd only must be disconnected,Point protective device in the fuel pump must be reversed or replaced with non polarised component.The only trickey thing is the tach changes.If some one does not have a compsite DIY listing I can supply,off list, the tach internal changes in picture form and as a schematic with guiding notes.---Keoke