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I have a special version of the code that supports tach input with 2 pulses per rev (4 cyl). Its accurate to about 150rpm and has saved me on many the occasion from an overspeed. The hardware is comprised of a 4v7 zener , 2k2 resistor and a .1uf ceramic on one of the icsp pins (forget which one!). A later code also has brake input in a similar fashion.
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Now, Cole, when you shift the gear and that little needle on the ammeter goes into the red and reads 2000 Amps, that's bad.
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