i would take nukedoc's suggestion and just tuning it respectively to those notes (G# C# F A#). My tuner tells how sharp or flat the note is so if your tuner can do that then you just have to make sure it's showing those flats (except for the F). Or, you could do it all by ear and play the first fret of each string and tune it up so it matches. That's what I did with my guitar whenever I tuned the strings down a step.