Burned-out tachometers - The Ford Barn

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Burned-out tachometers

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03-26-2026, 09:50 AM	#6
JayChicago Senior Member Join Date: Jan 2019 Location: Chicago Posts: 1,029	Re: Burned-out tachometers Sponsored Links (Register now to hide all advertisements) Original post never said, but based on his voltage readings, must be a 12 volt car. I don’t know why the tachs keep failing. They are designed for 12 volt negative ground. Is your car negative ground? Could the charging system be exceeding normal voltage? Modern electronic devices are sensitive to voltage spikes. Im just guessing here. Last edited by JayChicago; 03-26-2026 at 09:59 AM.

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