Here's another question though... I see that the MSD requires another "box" so that you can feed the stock tachometer. I've looked at the wiring for the MSD 6 series and that doesn't make sense to me. Where exactly, is the stock tach getting spark signal from? What I mean is... I'd always thought that it got it's feed from the wire going to the coil. The MSD appears to get it's signal from that same wire so why would you need to feed the stock tach differently after installing the MSD?