I have the same setup, and would like to do exactly what you are wanting to do. I talked with a couple xantrex dealers and unfortunately it is not possible to use the scp with the older 458s. They did tell me that it is a simple plug and play with the new inverter, same network cable. I've not seen the connections, so don't have first hand knowledge.
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2004 Monico Diplomat LE 40DST, 2013 Ram 1500 toad, with a Harley Ultra limited in the box.
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