This article will document the installation of Electric Power Assisted Steering (EPAS) into my 1972 Opel Ascona wagon.
This unit requires an input from a sensor on the wheel to determine the amount of assist needed. There are several aftermarket controllers available to workaround the speed sensor. I ordered one on eBay from bruno_steering .
Connecting the EPS unit to the Opel steering column
Here is the Saturn EPS next to the Opel steering column. The splines on the EPS are 3/4-36 on the steering wheel side and 16.5mm-36 on the rack side.