Pertronix 71281 Ignitor III Adaptive Dwell Control for Multiple Spark with Digital Rev Limiter Ford 8 Cylinder Multiple sparks thru the entire RPM range Integrated digital REV limiter with LED feedback for precise RPM setting Memory safe function stores settings eliminating unintended changes to Rev limit Adaptive dwell maintains peak energy throughout the entire RPM range, reducing misfires while improving engine performa Peak current level is reached just prior to spark for maximum energy without the heat build-up, increasing coil performance and module reliability