With.......
See page 22
http://static.summitracing.com/global/images/instructions/msd-6200%282%291.pdfAlso see page 7, you'll need part number 8910 (the special version, not the one usually sold) to have the tach work. To get the special version you need to call MSD and tell them that with the 8910 you have, the engine runs, but the tach doesn't work (they then just sent my one (that was 10 year ago)). It's basically a ballast resistor like those in the old flourcesent lights, or a AC/AC transformer, so you might be able to make one.........