MSD Digital 6CT ignition controllers feature:

Built-in start retard adjustable in 0, 10, or 20 degree increments for quick, easy starts and extended starter life
LED displays rev limit, highest rpm turned, cylinder select, start retard, battery voltage, and can be set to tach mode
Full delivery of spark energy down to 6 V battery supply
Highly efficient, low-current draw for extended battery life
Single plug-in connector for clean wiring
Tamper-proof screws to prevent modification of unit
Records highest rpm the engine turned for last 20 minutes of run time
Works on 4, 6, and 8-cylinder engines
Reverse polarity and overheat protection provide ultimate reliability

MSD Circle Track 6CT Ignition Video



MSD 6CT Ignition Under Water Test Video