What scale length is your git and what octaves are you trying to tune to and how much tension do you like?
Hi, if you look at the note of the strings and not the numbers, should give you an idea.
eg..5 - A. 4 - D. and 3 - G in a standard pack. Tune the strings to concert pitch and drop the A string back to G. I think you are tuning up an octave on the A string.
Ok, seems to me you are wanting to tune G2, D3, G3. If you don't have a tuner that shows the octave number you can download a tuning app for your phone that does.
I just re-read your original post and noticed that you said you were trying to tune the G by matching it to the 7th fret on the D. You'd want to use the 5th fret on the D (which is G3) not the 7th fret (which is A3) and you'd want your low G to be an octave lower instead of matching the fretted G on the D string.
Using a digital tuner is much easier though. : )
and make sure your tuner is in chromatic mode and not guitar mode.