Just purchased a 1991 Service Manual for D/W 150-350 and it came with the Diesel Engine Supplement. I don't have a need for the Supplement and would be willing to help out a fellow Dodge brother. I paid $70 for both manuals and $10 for shipping on ebay. It is in great shape. I'd be willing to take $25 bucks and I'll pay the shipping. PM me if your interested.

The Supplement is on the 5.9L diesel motor and covers brakes, cooling system, instrument panel and gauges, speed control system, wiring diagrams, engine diagnosis and service, exhaust system and intake manifold, fuel system, steering, transmission, air conditioning, and emission control systems.