#4456, "RE: Question on MS and MSD-DIS" In response to In response to 4
You'll need to follow the instructions in the link to ensure your ECU is properly modified internally. If so, then yes, it is as simple as installing a few additional wires. Don't forget that you'll need to add a second channel to the Megasquirt ECU. Here is a link to the configuration page for 420A: