Sorry, but Newell didn't provide Owner's Manuals in the time frame that your coach was made.
As to your 903 Cummins, check eBay for manuals. They show up from time to time.
As to the switches and gauges, ask here and we will attempt to answer your questions. Newell used the same logic on many of their coaches for the gauges and switches.
Don't be shy to ask diesel related questions either.
Congratulations on your purchase of a Newell. We are here to try to make the experience a very positive one.
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