one of the best thing i did to mine,msd one,they fitted driver into ecu,so was really just plug and play,did need to modify tacho,full instructions and was easy enough to solder the wee loop wire in at the back of the tacho,seemingly not all need tacho modded,never miss fires in damp now,which it always did before unless sprayed wd40 on connections to group a coil and cap etc every other day,cars my daily driver

colin