73 duster - gas gauge not working

Alright fellas I got under the car this weekend to look at the sending unit.

Im far from a mechanic, so I don't assume much when working on my car.

This is what I got...

This is on the front of the tank ( encase the orientation is questionable)

The small wire is what sends the shows on the dash right?
I couldn't see where the rubber hose in the background went to.
But I should look on the rubber wire in the foreground to ground it out?