The MSD controller connects to all 6AL, 6BTM, SCI, 7AL-2, 8, or 10-series MSD ignitions with just a few wires. You can see our unit sitting on top of the dyno's 10-amp AC power supply and connected to the MSD 7AL-2 box with just three wires (red to switched ignition, brown/white to points input, black to ground). A computer cable connects our laptop for timing adjustments. Adjustments can also be made using MSD's hand-held programmer/monitor (PN 7550). The rolled up wires coming out of the MSD box are for things like retard triggers and rpm switches.