For tuning dadgad on my 12 string would it be:
D1D2 A1A2 etc up to gad (leaving gad same octave) on my tuner to get the correct octaves?
For tuning dadgad on my 12 string would it be:
D1D2 A1A2 etc up to gad (leaving gad same octave) on my tuner to get the correct octaves?
Your numbers are off by one, it would be D3 D2 etc. The note D1 is a step below the range of a bass in standard tuning.
Also, most 12 string guitars have the G (3rd) string in octaves, not unisons. One could modify their setup if they want the G in unison though.
Here is a diagram of the notes on a 12 string with standard tuning with the alternate notes you want written in:
FYI, some people would use an F# instead of a G so the guitar is tuned to a D chord (open D tuning) but I answered based exactly on what you asked for.