jumpinjan
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This is a rebuilt Tiger tachometer with new resistors & caps and so on. To calibrate I used a real coil from a GM LS-2 engine and it's driven by a 5V digital signal provided by my signal generator. The 12V lead to power the coil is the primary winding on the tach, of course. And the coil is firing a spark plug.
Here's a short video clip of the test on the bench:
Jan
Here's a short video clip of the test on the bench: