Need help w/ electrical

[47 business coupe]

I bought a 47 plymouth p15 upgraded to 12 v and a new wiring harness  and all the lighting of gages don't work but the running or driving lights do (light stitch is on and knob pulled out) I found a ground that seems to be loose coming off the back plate of the gage housing 

 

And no where to connect stripped end.

Do I just crimp on length and connect to frame? Or to the battery? What's the best way to ground said wire?

Edited May 25, 2023 by 47 business coupe (see edit history)

[1939_Buick]

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