Fuel Gauge Inop

Dana,
Definitely appreciate the input with regards to rechecking resistance methods. I was remiss in stating initial post that all other gauges were operational and that I had the cluster circuit board out and verified pin security. Point taken as to " should be no baffles" in tank. That was my thought process after I placed the sender in upside down but obviously couldn't secure it and it gauge read. I'll recheck power lead to sender also. Appreciate your detailed response...John