1676 8-function decoder for HO-Scale locomotives equipped with a MTC21-pin connector and Keep-Alive wires and connector – #TCS-EU821-KAC – Litchfield Station
21MTC Interface
21-Pin to 8-Pin Decoder Adaptor Board (Wired DCC Harness with NEM652 8-Pin Plug) - Cables & Adapters | Facebook Marketplace