It took me having 4 units shipped from 2 different vendors to get one that was in spec. I learned to test them after the 2nd dud.

Vans Auto provided the one that actually worked, and it was the 2nd one they shipped. I bet if you called them, they would do the same on the 1st one.

The ones from Classic were both had the correct readings in way less arm travel. The 1st Vans one went to infinite resistance halfway through travel.

Vans tested the 2nd one they sent me before shipping. I now have my original 5/16" sender and three 3/8" senders that don't work. No one wanted them back, Classic just gave me a store credit, including the shipping cost which was cool.