Fuel sender

What I have found since throwing mine out years ago along with the OEM tank. I purchased one like you have only to have it not read properly. In researching the manufactures of the type that you have, they all told me that it reads linear resistance. It's not a Canadian thing at all.
The Mopar fuel gauges read non-linear, that's why I'm looking for the one I pictured.
That one pictured is the one that's in my tank now. The problem it's not for a Duster 18 gallon tank. When full it only reads just about 3/4 and empty at an 1/8th. When it reads just below a half, I can only add about 5-6 gallons of fuel.
I hope this clears it up, Jack