Variability in Terrestrial Carbon Sinks over Two Decades

The invention contemplates tachometer apparatus which functions from an electric pulse input which is of frequency directly related to engine speed of an internal combustion engine. In application to a modern automobile assembly line wherein successively assembled vehicles may have various-sized engines in random succession, the particular feature of the invention is that with essentially the same rectifier circuit and associated indicating meter, and with the simplest of manipulation or connection of a single element, the meter can be direct-reading and fully calibrated whether the invention is applied to a four-cylinder engine, to an eight-cylinder engine or to a six-cylinder engine.

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