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Tom,
Most of the 'modern' dwell/tach/multimeters of the past 20 years are inductive pickup that clip-on the No. 1 sparkplug lead. One of the very best, but a little pricey, is the Fluke 88. Of course it does a lot of other things, too, like injector pulse timing, temperature, and typical digital multimeter functions.
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Warren Hall
1973 911S Targa
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