For those who are considering adding a tachometer to their toolbox- here's my 2 cents worth. I've been using this Easy Tach Plus for about a week now and like it. You can use it as an inductive tach or pop the lead in place and clamp it to the plug wire. $40-50 worth of rpm goodness. I replaced my original Dixson tach with another last year- which has proven erratic as of late.