Add on low primer switch. Placed on original Dillon Primer check, used as signal source for Mark7 Autodrive or other external control systems.
Microswitch used (for example): https://www.aliexpress.com/item/4000638031271.html
Use CA glue to attach the sensor plate to the microswitch lever.
Additional weight needed on the primer rod for reliable functionality.
The author hasn't provided the model origin yet.