EDIS and Megajolt installation related topics. Be sure to review the <a href="http://www.autosportlabs.net/MJLJ_V4_vehicle_installation_guide">Vehicle installation guide</a>
Any EDIS 4.
If you are installing on a 4 cylinder car of course.
Some are easier installs than others.
I.e. pin 11 being blanked, or not. If you run your rev counter from that pin.
But other than that, all the edis4 units I've used have been fine other than pin 11.