Ignition Box, MSD 6ALN (NASCAR) with 6 pin connector and plug in rev limiter modules

Comes with a built-in rev limiter and plug-in module to change the RPM limits in seconds.  Rev-limiting modules in 100 RPM increments with 3000, 6000, 7000, and 8000 rpm modules supplied in the box.  Some tachometers need MSD tach adapter for ignition box compatibility.