CDI Electronics 123-7566 Electronic Shift Assist Module for OMC Delco Distributor

The CDI Electronics 123-7566 is an Electronic Shift Assist (ESA) module designed specifically for OMC sterndrive engines equipped with Delco distributors. This critical ignition component temporarily retards engine timing during gear shifts to reduce stress on the drive system and ensure smooth, reliable shifting performance.

Key Features:

• Designed for OMC/Johnson/Evinrude sterndrives with Delco EST distributors
• Compatible with 4-cylinder and V8 engines (single 5-pin connector configuration)
• Features tachometer output for proper gauge operation
• Prevents engine stalling during shifts to neutral
• Includes complete wiring harness with single 5-pin connector
• Backed by a 1-year manufacturer warranty

Replaces OEM Numbers: 987566, 987874, 763806, 987397, 3854714

This shift assist module is an essential component for maintaining proper shifting function on OMC sterndrive applications. When the ESA module fails, common symptoms include engine stalling when shifting into or out of gear, rough shifts, or difficulty engaging gears. CDI Electronics manufactures this module to OEM specifications with improved reliability and durability.