Ok your last description clarifies and "sounds better."
I don't think you need the no8 ground, though, just use the body.
You need a good at least no 10 from a battery source to the starter relay stud, that is one of the contacts, so when the relay is "made" the contacts close and send that power down to the solenoid.
The coil or "signal" as you call it for the starter relay is the two push on terminals. Makes no difference which is which
I lost track if you have a stick/ stick with clutch safety switch, or automatic
If you have a clutch safety switch or auto, either of the push on terminals of the relay must go to the center terminal of the NSS, providing a ground in park or neutral, or when the clutch is depressed.
If you have a stick with no clutch safety, just permanently ground either of the starter relay terminals
The remaining one of course goes to the start terminal of the IGN switch, originally yellow off the switch.
What are you using for an ignition switch, and do you understand how to handle the IGN1 / IGN2 switch circuits, that is, the ballast bypass?
Page 17 of your manual shows a diode for that purpose, but if you are still using a Mopar switch, there is no reason to do that.