Thanks! If 7.7 ohms is the reading, that will equate to almost exactly 1/4 of a tank of gas. Either your sending unit doesn't work when it is submerged in gas (a possibility) or the float isn't floating (but you say you tried cork and other types of floats) or I suppose it is possible there is something in the way the rod is set up that might be causing your sender to be in the wrong spot when it is installed. Was that rod very long or very short? Some of the senders require you to cut the rod to length.
