You're not going to have much use for the dwell function of a dwell tachometer on late-model vehicles as it is controlled by the computer and is not adjustable. However, if you need to set the base idle speed, and it is adjustable, the tachometer will provide more accuracy than one on your instrument cluster. You don't need one of those gigantic analyzers to set the rpm on your vehicle. Prices range from less than $50–$100 and more. Make sure you get a dwell-tach or tach that is compatible with your vehicle's ignition system.
Dwell-tachs are simple to hook up. Some dwell-tachs are powered by the circuit being tested, some operate off the vehicle battery, and some have their own power source. Electronic ignition systems have specific connection procedures and you'll have to check with your dealer to determine the tach hook-up.
There are several Multi-Meter/Engine Analyzers on the market which provide the functions of a Multi Meter and a Engine Analyzers (Dwell & Tach).
| Fig. 1: Typical aftermarket dwell tachometer — used
to check dwell on old point type ignition, and RPM on point and electronic
ignition systems.
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