Robert:
Welcome to the forum. You will find a bunch of wonderful folks and much helpful info. Perhaps I can save you from spending more money on your problem. The Freightliner VDC/VDU in some model years had a problem with cold solder joints. The problem can manifest itself as you describe...gauges erratic, especially the air gauges. If you are handy with tools and can solder carefully with a low wattage soldering pen, you can fix the problem in about an hour.
If you send me your email address (use a private message if you wish), I will send the VDC repair article to you. It has photos and step-by-step instructions. I did the repair along with a number of other folks here and cured the problems with the gauges.
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'07 Country Coach Allure 470 Siskiyou Summit #31578, Cummins ISL 425; 2014 Ford F150 toad; Air Force One Toad Brake.
Glen Allen, VA; Smith Mountain Lake, VA.
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