EDIS stands for electronic distributor ignition system.

Basicly its an ignition system that uses a trigger wheel to give timing and a coil controlled by a module. The coil fires on 2 seperate cycles so each cylinder gets a spark twice per combustion cycle and one spark is waste, hence the term "Wasted Spark"

MS is short for Megasquirt

megasquirt is a DIY engine management system that is available in many different stages and setups, you can make MS work on anything from lawnmowers, to old air cooled beetles, to 1000hp salt flats top speed cars. www.diyautotune.com is the largest distributor for the ms system and is located right here in Georgia.