I can only speak assuming your coach is set up the same as mine. I have a 1990 CC Concept with a Leece-Neville alternator. If yours is like mine, which is a common design, the tachometer gets its signal from one of the three AC (not DC) posts on the alternator. It doesn’t matter which of the three it’s connected to. If the tachometer fails or is intermittent it is most likely a sign of an alternator failure. When the tach fails check to see if the chassis voltage drops as well as a result of the alternator not charging.
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Russ
1990 Country Coach Concept 36' Antares
2006 Jeep Wrangler X, Blue Ox Towbar
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