Just and update... the question around connectivity has been resolved. Thanks everyone.
No pre-charge resistor or coil supression diode is required on the solenoid as the 1268-5403 controller has an internal pre-charge resistor and diode already. Some Curtis controllers do, some don't. Curtis does not recommend.
See:
https://www.buggiesgonewild.com/show...=179661&page=2
Cheers!