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I'm using an external tach during engine break in because the gauge cluster is out of the car.
If I connect the tach directly to the tach terminal on the HEI, it reads just fine. But, if I instead connect the tach through the tach filter it reads fine at idle and up to about 1200 RPM. Once I rev the engine above 1200 RPM the tach starts to swing back and forth from about 500 to 1800 RPM.
Is the tach bad or the filter? Any ideas?
Jack
If I connect the tach directly to the tach terminal on the HEI, it reads just fine. But, if I instead connect the tach through the tach filter it reads fine at idle and up to about 1200 RPM. Once I rev the engine above 1200 RPM the tach starts to swing back and forth from about 500 to 1800 RPM.
Is the tach bad or the filter? Any ideas?
Jack
