I have a 1982 Corvette.  The low fuel indicator light stays on all the time.  The fuel gauge works.  I need to know how to troubleshoot the indicator light.  

It maybe time to replace the wiring flex board behind the gages. Because the lights that twist in, on the board ware and just ground to the Metal frame.
I've replaced several and before reassembly put heavy plastic tap behind each light opening to syop grounding problems  

Thanks, I did that but it didn't change anything.  I'm wondering if there is something in the gas tank that is malfunctioning.