Gas gauge problems

Dana67Dart said
First do as others have said and measure the resistance that the sender is providing to ground.

This chart is from my aftermarket sender vs my NOS sender.

yours should have similar readings at a particular gallons in the tank.

you can see on the chart that the NOS mopar sender is not linear but the aftermarket on is.

Non linear matches OE gauge Linear gives bad readings on OE gauge

View attachment 1715213080 View attachment 1715213081

Did you generate this yourself, or where did you get this?

ALSO TO OP: REpop senders have a VERY bad reputation for accuraccy. For about 50 bucks, there is a little add-on box you can buy which can be used to accurize your gauge readings "Meter Match"

TechnoVersions - MeterMatch for Analog Gauge Correction

I would NOT play with this until you get the system working or replace sender and do so........