And you're probably correct Robert...I'm betting the aftermarket unit just is'nt close to the correct sweep judging by the values that have been stated...Bending the stop won't give that much more on the top end...And since taking out the cluster for caliberation/sender sync is not on the list there's only one quick fix...You need to bend the float arm before it contacts the upper stop...The basic idea would be to bend the arm in a way that would rotate the center stud up further to gain the values you need for a full tank but keep the float in the same general orientation....Now, you may not get it to read completely full without the actual rallye gauge caliberation with the sending unit...but you'll surely get a much more accurate, useable needle sweep and reading...