Reply to "Tach Trouble"

bosswrenchMember

Inside the tach case is a small circuit board driving the needle, that among other parts holds a couple of all-glass precision resistors. On one car, a glass resistor had cracked in two and needed a microscope to even see the crack. I found that if you replace the 2% resistor with one (or more) even slightly off in value, the repaired tach won't read correctly and there are no built-in adjustments. Commonly available resistors are 5%, 10% or even more. Not a job for a rookie EE like me...

9/9/1412:38 PM

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