Get "ted nash's studies in high harmonics" this book gives you two sets of fingerings for tenor and alto.Best of luck to you :)

there's also this website: www.wfg.woodwind.org/sax/index.html for F i use 1_3|1_3/Eb this is the end of my practical range, but i can go higher.. F# i use side D,Eb,F nothing else. G i use _2_|12_ G#/Ab i use 1_3|1_3/Eb A i use 123|123 Bb i use 1_3|1_3/Eb the fingering 1_3|1_3/Eb has about a thousand harmonics (lol a little exagerated, but there is a lot). hope i helped.