Gas gauge 74 Duster help

You can buy "repop" senders they are not accurate

You "may" find someone to rebuild yours

You likely won't find a NOS OEM sender

There is a device called a "meter match" to calibrate an odd sender to your gauge

TechnoVersions - MeterMatch for Analog Gauge Correction

I bought one tried it on the bench. Have not run it in the car "it's apart" LOL