check Hi/Low Rev's in Settings and make sure all the Ne points (rev range) is set to 0% before tune dyno. Don't play with the settings because if you adjust it accidentally and make your car too lean, lean = detonation = engine damage.
To answer your question, the SAFC uses hardwire. from the diagram it should be HW4. Set the in/out to number 4, cyc set to 6 with arrow pointing upwards.