>--- Keith Tanner <keith@miata.net> wrote:
>
>> I don't know about you guys, but my alternator turns at a
>> different speed
>> than my crankshaft. There may be some interesting math
>> involved.
>
>Hence my comment about calibrating it on the vehicle
>against a known good reference. Things like this are why
>yours truly owns a mechanical interface digital tachometer.
>
The tachs I'm familiar with can be adjusted for a number of pulses
per revolution -- say 3 to 30. You set a coarse adjustment switch,
and then fiddle with a trimming pot until it matches your reference
tach.
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