Audio Tach

The one time every engine seems to run quiet is when you're trying to listen for the shift. It doesn't matter how noisy it normally runs—when you need to hear the engine rpm change, all of a sudden it purrs.

That's why we came up with the Schaffer® Audio Tach—a small, inexpensive way for you to hear even the smallest changes in engine speed.

Just plug the Audio Tach into the car's cigarette lighter. In seconds, you can hear changes as small as a few rpm. That's because the Audio Tach creates a whining noise that varies with the alternator output. The faster the engine rpm, the faster the alternator turns, so the higher its output.

It's that simple. The Audio Tach works with any car that has a working cigarette lighter and alternator. It needs no fancy adapters, no special tools.

So stop straining to listen for shifts and order your Audio Tach today!