snowcruiser
New member
"I recently had to replace the
"I recently had to replace the tachometer (needle feel off) on my 140 I/O. I found a Mercury tach and installed it, but it only seems to read about 30% of the actual RPM's. The unit I took out had a selector on the back, but this one does not. I'm wondering if the connection point on the engine might be different, since I can't seem to change the pulse setting on the replacement unit. Anyone have any ideas on how to get this replacement tach to read the correct RPM's?"
"I recently had to replace the tachometer (needle feel off) on my 140 I/O. I found a Mercury tach and installed it, but it only seems to read about 30% of the actual RPM's. The unit I took out had a selector on the back, but this one does not. I'm wondering if the connection point on the engine might be different, since I can't seem to change the pulse setting on the replacement unit. Anyone have any ideas on how to get this replacement tach to read the correct RPM's?"