oops, actually you need to follow the flowchart on page EL-96 for the fuel gauge
"C" on that page
http://www.nicoclub.com/FSM/quest/1997_Quest/el.pdf
it's acting like the plug is disconnected when you're always reading "full" all the time
did you verify if the float is moving up and down & the ohm readings change with the movement before you installed it?
ohm values are stated on EL-100 (the readings should go lower as the float arm is lower to empty)