88961821 Ramjet ZL1 MEFI 4 replacement module. For use ONLY on engines that have a 4 module currently installed.
Will not replace a 3 module, wiring is different.
MEFI 3 module IS NO LONGER AVAILABLE.
If a replacement is needed for a 3 module, you must update your system to MEFI 4 status by using part # 88961967 Harness Kit and this module.