Johnstone, the only alterations that you will need to make to the wiring will be: 1) Reverse the battery terminal leads, and 2) reverse the ammeter connections. The dynamo is re-polarised by flashing. This done with the green lead that connects the dynamo to the regulator (F) terminal. Disconnect the green lead from the regulator and dab it on the battery positive terminal a couple of times. You should see a little spark when you do that. Reconnect green lead to (F) terminal on regulator. That's it job done. The DVR2 when you order will need to be specified as to which polarity you require. It comes with full fitting instructions, and the unit itself is marked clearly showing the correct connections.