Sending unit refurb?

The sender did change in later year models ( I forget what year ) and that design is what the aftermarket reproduces and lists for all models. I found that same sender in 73 and 75 Valiants. In both, the gauge would stay up near full for days, then start falling toward 1/4 in a hurry. Then 1/4 to empty seemed about right. Today, based on all I've read here, I believe that was pretty much the norm' for this sender and accompanying 13 ohm gauge. The earlier sender and 20 ohm gauge worked much better. Restore the earlier sender and attach to 13 ohm gauge? Who knows? Might still need the meter match.