I have an if-output installed in the Ft1000mp mkv field and the rsp1a connected to that. Then connected SDR-console to the Yaesu using Omni-Rig and then I connect Logger32 to the sdr-console using the external radio interface. Have a look at this thread near the bottom of page 2
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https://groups.io/g/hamlogger/message/78936

If you are using a splitter (so the SDR is connected to the antenna instead of the if output) then you can use the method Rick N2AMG used.
73, Chuck
N0NC