Short of pulling the pump out again and inspecting it, you really cannot do much. If you want to figure out if it is the sender or the gauge (not likely the gauge) you could measure the resistance at the connector with a full tank of gas and compare it to the resistance with an empty one. If the resistance does not change, then the float is probably stuck. The very least you can do is unplug it and then plug it back in again to make sure that the connector is properly seated.
94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new
88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new