You should check your battery connections, and your alternator. All your instruments are electric, and work only when the alternator is charging and the battery is hooked up correctly. A loose connection can cause this problem immediately, while an alternator problem will cause the instruments to fail first, then once the battery runs down, the engine will stall. Also, don't forget to check BOTH ends of the battery cables.
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i would start by unpluging my tach.it comes directly from ignition.might be grounding out.
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