Rb25 s13 speedo fix?

[billy_spdips]

Yes I have used the search button but people saying things will work then others say that they won't have me confused. And yes I know about lsauto but don't feel like spending the money on it. So Getting ready to throw the Rb25 into my s13 and need a solid will work answer on how to get my speedo to read MPH properly. I've read that I can use a ka or z32 n/a speed sensor with the Rb gear on them. If this is true witch ka sensor SOCH or DOCH cause I have a DOCH one in the garage.