ducman82 wrote:so i could splice all the coil signal ground together and run them to pins 7-19? on the man MS connector? (being they are all common grounds?) or, being that i have to ground some on the engine anyway, i could just hook them up to the coils, while some go to ground?
Ideally, you should ground each individual logic ground wire to wherever your sensors are grounded; usually this is a single pin on the main connector. The "power" grounds should be grounded at the engine block, along with the "power" ground wires from your MegaSquirt ECU and MS3X.