Hi, Does anyone have good knowledge of using these things? I bought one, read the manual and tried to use it without much luck. Is the reading correct when the little wire is vibrating a lot at the end? Like a big dog that sees a bone? I tried to calibrate it against my Toyota 4-cylinder and my Suburban V-8. Engine Tach Vibratech Toyota 2000 4000 Suburban 2100 3500 Lawnmower ---- 3000 full power XR400 ---- 1300, 1/8 turn on idle 2600. I'll give it another try, then I'm sending it back. Anyone know of a good inexpensive digital Tach?