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CR8 is a power LED, illuminated when the 7I96S 3.3V is present.

Well, the suggestion to put a pot on the input seems to of done the trick, as I had to go look at the pictures in the manual again I noticed the factory had the signal on the wrong pin on the VFD. (sigh) Hooking up the pot worked and when the correct pin was wired in, it's working!!! So that problem solved. At least now I can focus on the limit/home switches all on one pin.

Thank you Murphy and Cake! I'm a bit overwhelmed seeing the spindle work as it should. Thank you!

I think that's explained in the Linuxcnc manual. If you look in that it may explain how to do it. What mill is it ? My .hal file I uploaded a few posts back. Have a look at that. It's a lathe though. I'll be starting my mill with remora next month.  I'm waiting for parts to arrive, to build a circuit to drive the 12v stepper drivers  first. My mill has limits and prox sensors.