When getting my car inspected, the guy clipped a wire onto my coil wire. It was wired to the computer, and it showed engine RPM on the screen. Are there any products that do a similar thing, but dont require the computer? My dad said he used to have one years ago, but he doesnt have it anymore. I need it because my Tach is Wayyyyy off, so I need something to I can set it. Thanks.

 

Its called an inductive pick up tach. I have no idea where you can buy one, lol, i'd reckon any good tool supplier would have 'em.
...ed