To install a Bachmamm dcc decoder in a Roundhouse 2-6-0,sound not required

[mohawk]

I have the Bachmann 4-4-0 and 4-6-0 with their dcc decoders installed and
would like to install one in the Roundhouse 2-6-0.The Bachmann decoder has 8
connections and the Roundhouse has 9 connections.I would appreciate any help
available to help with this instalation.
                                                                                     Thanks,
                                                                                      Mohawk