I have a 1975 Evinrude 70 HP outboard and I cannot get the tach to work. This is the second tach that I have had on this boat and the first one never worked either. I fed it a square wave signal from a signal generator and it worked fine. This one is a brand new (NOS) OMC digital tach and it...
My tachometer pegs out whenever the engine is running, no matter what the rpm. It reads zero when the engine is not running. I recently purchased the boat. I checked the charging circuit and had to replace the rectifier. It now charges OK but the tach is out to lunch. The tach is connected...
