[Ironhorse]

Didn't find the sending unit from the '70 3/4 ton with the 350 V8. I do have a sending unit from a 67 GMC with a non-running in-line six. It looks good, moves freely on the float arm, still has the brass float and sock altho it is discolored with age.

Is there any way to test a sending unit out of the stock tank laying on the work bench?

Never have tried doing that before, no idea how. I do have a multi-meter but not sure how to attach the leads for a correct reading.