The engine is an RSD-5. Jersey Central. 30-20484-1. The whole thing is shot. It's really a matter of basically putting in a new board and installing new wire bundles. What exactly is included in that upgrade kit?
A complete kit. board, board bracket, electrocouplers, LEDs, wiring harness, tach sensor, tach tape, screws, sensor mounting brackets, and new speaker. When they say kit- it's just that- a true kit of all the electronics in a typical engine-LEDs for all lights, complete 40 pin wiring harness with all optional lighting options -example mars, ditch lights,markers, strobe, etc..
In fact, one could say, the diesel kit is the most comprehensive kit (compared to the steam) because of that fact of all the additional LEDs provided. You could add every possible known option and have more lights than a Christmas tree in many cases.
The Diesel upgrade manual https://mthtrains.com/sites/de...ction/50as18328i.pdf
Keep in mind, many of these outputs are pairs of LEDs, not just singles. It's often more features than many of the models may have even had in first place before upgrading.