Most likely cause of fuel gauge being inaccurate?

'74 Sport said

Has the fuel gauge sending unit been replaced recently with an aftermarket one? .

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This seems to be a common problem

There are many pitfalls

Bad connections in the system, how old are these girls, again?

Inaccurate IVR unit

Inaccurate gauge unit

"In general" sender problems, old, rusty, chinese, ..... ... . . .. . . . .. . .

There was a discussion some time ago, someone is making a guage calibration device you can install inline for about 40 bucks


This

http://technoversions.com/MeterMatchHome.html

which came from here

http://www.forabodiesonly.com/mopar/showthread.php?t=275117

and another thread related

http://www.forabodiesonly.com/mopar/showthread.php?t=264543