Wiring diagram gas tank sensor

Hello, before getting into wiring, start with a diagnostic tool that can active command the gauge and read the sending unit to see what each does / is doing. Once you can verify the gauge is working properly, then you can check the wiring to ensure there is no concern there. But to do that without the first step would be inappropriate. Wiring diagrams of the best quality are available through Chevrolet's shop manual, or aftermarket publications such as Mitchell One and Alldata. www.alldatadiy.com is one resource you could use to get what you need. Good luck.