[mickmate]

It's on the Centroid inductive tube senders, both two and three wire. You set one screw to read empty when it's dry or out of the tank, the full screw I have adjusted with the wires hooked up and submerging the tube in a gas can. Now it's calibrated without having to play with a tank full of fuel. You smell a lot better when you come in from tinkering time that way. Peter at Nisonger is very knowledgable on these things if you have questions.