I have not done a DZ switch motor to a Scaletrax switch but have done an 027 switch and converted it to a DZ-1000 switch machine. I had to gut the switch housing of all former switch electrical and strip it down. Was able to attach the pin or rod from the DZ-1000 to the switch track throw lever inside the switch, so now I have a useful switch instead of a beat-up dud. I attached the DZ-1000 with two screws and adjusted the throw ability of the switch machine.
I just hope that you don't have to strip the Scaletrax switch down to the base like I did for the 027 switch. Because once you strip it that's it for it's former use.
Lee Fritz