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The needle on my tach jumps around. What's wrong? |
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- A loose connection, in the power, ground or tach signal wires can cause this behavior.
- Check to see that all connection points are solid and well-insulated from other wires.
- If your vehicle has a high-performance, aftermarket ignition system, this can cause erratic readings.
- Most ignition makers offer a tach filter or adapter that provides a clean tach signal. Installing one of these adapters will usually solve the problem.
- Solid copper plug wires can radiate electrical "noise" which can cause erratic tach readings.
- Installing resistor plug wires and/or shielding the green tach lead can reduce this interference.
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