Bench Testing Fuel Sending Unit

[Green Bean]

I'm trying to bench test a new OEM fuel sending unit PN 83320-3520. From what I've read, it should test 110 ohms empty and 3 ohms full. Using a digital multimeter, I'm getting around 24 ohms at various positions through the arch. I guess it is possible that I got a defective unit but it is much more likely that I'm probably doing it wrong. Is there some secret to taking ohm readings on these things.
Thanks.

 

[ToyotaMatt]

 

[UZJ40]

When I was testing my 80 series sender, I was getting very erratic readings as well. It had been removed from the vehicle for a few years, so I cleaned the contacts with brake clean and it immediately fixed it. Maybe give that a try.