gas gauge bench test

[06Daytona]

The gas gauge in my Cuda/Challenger/Charger and Duster don't read properly and I'd like to bench test to see if the pick up is working or if it's poor wiring somewhere else. Where do I connect the ohm meter to see if  the pick ups are working? I've tried it in various places with no luck, so I thought I would ask instead of just assuming they're all dead

[fantum]

The question is, are they working at all?  If so, what symptoms are you having?  finally, are you sure they wre properly adjusted when they were installed (and when was the last time you checked)?

Just some troubleshooting questions that the answers will help us help you.

[06Daytona]

I have no idea if any of them are working, that's why I wanted to test the pickup to see if it reads differently from full to empty.
The Cuda would read 1/2 tank when full and start jumping around when empty, the Challenger reads properly sometimes and empty other times I think, but it's been quite a while since I've had the Challenger out to play with more than a gas can full of gas at a time. I have no idea if they've ever been replaced.

I've only had the Challenger for a year, but thought that with the 440 in it now I'd rather take the car to the gas station and not the gas station to the car.
I looked on google and it's either new style fuel pickups, or pickups that look completely different from the ones I have. 

[dodj]

Clip one of your resistance meter leads to the threaded post that your gauge wire connects to, clip the other one to the fuel line of the sending unit. The resistance should sweep evenly between 10 ohms and 70-75 ohms.

[06Daytona]

Thanks