I only get upset about it when people insist that using a tach is a MUST for tuning a 4-stroke.

Using a tach is a great way to tune an engine (2 or 4-stroke) IF it is used properly. But too often it is not used properly, and just as often, the person using it could do it just as easily by ear.

For those who say, "You need a tach to tune a 4-stroke", I say, "Then you had better use it on your 2-strokes as well"

If you can tune a 2-stroke by ear, then there is no reason why you couldn't tune a 4-stroke by ear.