Hi Allen; my tach. sender, amplifier , or as M.B. mech. calls "Transducer" was doing the same; intermittent working; got one on ebay; ok; thought well, i can't loose much; I'll tear into this; about an hour or more carefully removing the silicone/ i noticed 2 breaks in solder around 2 wires; i just re soldered all connections on circuit board; now works ok; so put it back in car been working for over a year now; But as 1 or both of the JIM'S suggest; it could also need a new capacitor or other small elect. part
oh i did not put silicone back; maybe need to for heat or vibration issues??? Steve
