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you could have a bad ground or something connected wrong.
first thing i would do is pull the wire off the left bulb in the tach and remove the led bulb. connect a test light to ground and probe the contact for the bulb with the left turn on. then repeat for the right. if the test light flashes its either the led bulbs or a wiring/ground problem after the bulbs.
use a test light, not a MM.
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