Stuck fuel gauge
 

Filled my tank up and the indicator, after quite a bit of driving has not moved. Also replaced the instrument cluster a few months ago.

Has the gauge ever worked since the cluster was replaced?

yea

and did you change anything or do any wiring work on the car, since the last time the gauge worked?

No I did not. It actually started going down everything is correct. The instrument cluster is working in accordance with the fuel pump component