Okay, I have a perfect setup with a signalink with a 
Pi4 with my 897D and with my 857D, and now I'm trying to set up my 817ND with a sabrent usb audio adapter and a pi3.  I have a z817 tuner also in the mix but I think Im missing the cable from the tuner 8 pin din computer to the USB pi.  Is it the ftdi USB cable? Where would I get an 8 pin to usb ftdi cable from? 

Okay, I just realized that the sabrent cable replaces the ftdi cable to the signal link, right?

I can't get flrig to work

You need a cable such as this for rig control. https://www.amazon.com/Letotech-chipset-Serial-Adapter-FT-817/dp/B07HSQ1L9V/ref=sr_1_3?keywords=ct-62+serial+usb+cable&qid=1648320181&sprefix=ct-62%2Caps%2C136&sr=8-3

Then you will need a cable to go from the sabrent sound card to the 817. https://www.ebay.com/itm/154518321764?_trkparms=amclksrc%3DITM%26aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160908105057%26meid%3D96ac3832dc4c48bbbb6f5f6ad49b214f%26pid%3D100675%26rk%3D1%26rkt%3D15%26sd%3D154518321764%26itm%3D154518321764%26pmt%3D0%26noa%3D1%26pg%3D2380057&_trksid=p2380057.c100675.m4236&_trkparms=pageci%3Ac4966dd7-ad34-11ec-a89b-16a0739d28a8%7Cparentrq%3Ac78b4a4717f0aaf00aeeacfafffc31be%7Ciid%3A1

73, de KM4ACK