Nevermind, I figured it out. By looking at the old pre and the new diagram I figured out the wire strands in the single core wire from the pups get twisted up together and soldered to ground tabs on the blend pot with the coresponding pup wire. ( neck pup on the top set and bridge pup on bottom set ). So now my new NTMB pre amp works with the MK1s

and it is a big improvement. Dead silent.

and quite transparent. Beefy bottom, no hiss at all from highs. it has a push/pull active/passive volume knob. So you can do an A/B comparrison. I like it.