I bought a used Nissan pickup truck a few years back that had absolutely no bells or whistles on it when it rolled off the assembly line. I wanted to make some “improvements” to the engine, and I wanted a tachometer to help assess the results (for better or worse). The add-on tachometers available in auto parts stores didn’t appeal to me, mostly because I knew I could make one myself if I put my mind to it. What I really wanted was a digital tachometer...
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