Ya, I had already found that. Still too blurry to read.
A good wiring diagram will have all the color codes for the wires and will tell the story pretty quickly, but only if they are legible.
For my 2017 Z8, the fuel gauge wiring to the connector is Blue-with-White-stripe/Green-with-Black-stripe, and after the connector (to the level sending unit in the tank) is Blue-with-White-stripe/Green.
Green/Black is power. Blue/White goes back to the fuel gauge. The gauge measures the difference in voltage between Green/Black and Blue/White. This was the only circuit with Blue/White.
Your photo looks like it could be Blue/White (L/W) and Green (G) before and after the connector, if I'm reading the blur correctly.
Can't depend 100% on color consistency between models, but .... I would expect the color coding on the diagrams to be the same.