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>
In the V4 the the MJLJ echoes the PIP signal as a 12v square wave. So yes, this should work with the majority of the rev counters out there. Comparing this with the Pin 11 signal may point to why your particular rev counter doesn't like the TACH_OUT signal.
Brent Picasso
CEO and Founder, Autosport Labs Facebook | Twitter