I actually set my output scale to roughly - 83 by just testing via rpm difference at 100 rpm 500 and 1000. 20% difference on driver displayed rpm conpared to linuxcnc. That turns out to be roughly 83 in the output scale and that kinda works out to set the atspeed signal true. (There still is some variance but so far with a Max_Error of 1 rpm it works)
