RE: Help with tach issues???
Exactly the problem that I have, with a smart reg on the port side and a dumb one on the Starboard side, I only get tach on port if the reg stops putting amps into the batteries. this usually only happens near the end of a voyage, after 2 or 3 hours running. I have become adept at guessing when both engines are at the same rpm, from the harmonics, so I really only need one operating tach. Single engine would be more of a test. So far I am 11 years with this situation and I haven't needed to do anything about it.