Originally Posted by boydgatlin
When the tach on my Yanmar 4JH3E quit, I found the problem to be nothing more serious than a bit of corrosion on the wire disconnects at the sensor. A bit of cleaning restored full functionality.
I've been down that track and no success but thanks for the tip.
The next problem is that the body of the sensor is badly rusted (one would think these things would be salt-water-resistant) and I'm not keen on trying to move if unless I know I need to.