I've added "Surf Organ 1" to the Rig Exchange. If you would like to hear it in a song context, I've posted a link to "Surf-alicious" in the Music section.
Don't strum. Use your fingers to pluck the strings, like playing a chord on a keyboard.
It has a slightly touch sensitive octave harmonic, for a "Rod Argent meets the Ventures" sound.
If it is too dirty, turn down your guitar (or the gain knob). If too clean - turn up the gain knob. I used a Marshall for the Leslie's amp 