IMPORTANT - The information on this page is ONLY applicable to the 3B engine. It is NOT transferable to the ABY engine. 

The image below depicts the pin locations as if viewing the connector on the ECU.

The image below depicts the 3B ECU pinout when viewing the cable assembly.

The following table defines the functionality of each of the 55 pins on the 3B Motronic ECU. 

File: Ready.or.not.v21874.zip ... ◎

: The loadout item selection list was redesigned into a vertical orientation with an interactive scroll bar for better navigation.

This build introduced several quality-of-life improvements and bug fixes intended to enhance the realism of tactical engagements: File: Ready.or.Not.v21874.zip ...

The .zip format in your query suggest a compressed archive of the game's installation or update files. You can find more detailed technical information and the full changelist on the official Ready or Not Steam News page . If you’d like more information, let me know: Do you need help with for Build 21874? : The loadout item selection list was redesigned