Digitrax.com:
Application Note: Atlas HH 600/660 HO-Scale steps needed for the DZ125PS or DZ143PS decoder installation

Remove couplers and carefully remove loco shell to
reveal the
8 pin dummy (DC) plug
Remove 8 pin dummy (DC) plug [picture shown with plug removed]
Plug in the DZ125PS or DZ143PS with orange wired #1 pin in pin with
triangle marked pin
Detail of DZ125PS or DZ143PS with
orange wired #1 pin correctly oriented

Tuck decoder in cab area of loco, replace shell and reinstall couplers.
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