I got a 85 90hp johnson that when it reaches<br />4000 - 4100 the tach falls to 0, and when I throtle back to that point it comes back up to 4000.The boat still runs great while this happens and it is still charging.I also installed a new tach and it still does it. Could it be a bad diode in the regulator assm.I could use any hints before I drop $300 on a new reg/rec assm.
