Fuel gauge wiring
Discussion
I can't find the wiring diagrams for the Griffith I'm afraid, but perhaps these may be close enough.
https://archive.org/details/manualzilla-id-6920751...
https://www.automotive-manuals.net/tvr/
https://archive.org/details/manualzilla-id-6920751...
https://www.automotive-manuals.net/tvr/
Gassing Station | Griffith | Top of Page | What's New | My Stuff