Help with grounds for rallye dash and harness

ahhh that makes sense. thanks!

so everything should be the same as that photo minus the ground for the ammeter/voltage meter?

Yes sir. All you want to do is put a actual copper wire in the places where the factory had used a daisy chain of parts and hardware to provide the ground path.
For those who might ask why so many little wires ? Wouldn't only 1 be enough ?
Answer, The one bulb closest to the screw where your one wire is attached will burn significantly brighter than all others.