I am trying to run an ancient calcomp 1026 using the latest 907 (also
calcomp7) driver for windows and having zero luck. Everything used to
work with ADI drivers for autocad, but I have never been able to get
the windows driver to work. If anyone has some insight I would
appreciate hearing it.

You need to look at the HArdware support in Autcad I would say you have
little hope I sold my old Calcomp tablet mouse works fine with added
keyboard shortcuts and lisp
ADI drivers are obsolete