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Old 06-13-2023, 02:05 AM   #3
'68OrangeSunshine
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Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,098
Re: Tachometer acting funny

LED bulbs are diodes, so they have polarity. Incandescent bulbs don't. If your LED was put in backwards, it might have shorted out the tach.
''Little sparks'' are not a good sign.
What brand of tach was it?
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