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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.

For now I'll address the next question I have. My machine was built with all 6 proximity sensors wired in series inside the machine with only 1 wire for signal. Homing works but any attempt to add the limit switch part in results in a failure to home after the first axis, saying that a limit switch was tripped. Reading through the forum, I saw a few mentions that it should be possible, but there were no actual examples of how it is done. The best I found was one with all 3 homes on one pin and all 3 limits on another. For now it is moving OK, (I figured out how scale works) and got it set right. Tell it to move 10mm and it moves 10mm. so I can fall back on the soft limits... Better than nothing.