Thank you to Bruce and Mr DCC University.
That’s easy. The TSU-1000 Tsunami has a 9-pin JST connector on it! All you need to do is to expose the connector without removing excess shrink tubing and plug in the JST Harness of your choice! Here’s how (CLICK on photos for more detail – use your BACK button to return):
First you use your HOBBY KNIFE to score the shrink across the 9-pin connector.
Next snip and peel the shrink back from the top and two sides of the connector. CAREFULLY trim the bottom, making sure NOT to dislodge the heat sink (the flat piece of metal on the bottom of the decoder as pictured here). If you dislodge the heat sink, the decoder will almost surely fail and not be covered by warranty.