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DIY 404b Tacho Cable

Actual Question

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It might be a grounding issue. Ensure all connections are secure and check the resistor values again.

Have you tried using a different LED? Sometimes, the LED itself can be faulty.

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Double-check the wiring diagram for your CSI device. Sometimes a missed connection can cause erratic behavior.

Make sure that the power supply you are using is stable and provides the correct voltage for the device.

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