1987 22r Pickup fuel gauge problems
 

So after a re-build, my fuel gauge decided to crap out on me. It shows empty no matter if a full, half, quarter tank, so I am suspicious if my fuel sender unit went out, because usually they will show some indication at varying tank levels. Do you think it is possible that one of these diode/resistors blew inside the cluster? I can see two that are connected to the needle for the fuel gauge, how would I got about testing these?
https://cimg5.ibsrv.net/gimg/www.yot...d9ebb383ae.jpg