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It depends on what is wrong with it.The tachometer takes input from the revolutions of the engine, so can you identify if the connection in the engine is okay, or if the connection to the actual guage(tachometer) on the dash is okay.A test would be to get a working instrument panel,replace yours and see if the rev-counter(tachometer) works. If it does then it might be cheaper to replace the whole instrument panel. If it does not then the problem might be in the engine, you might want an auto-electrician to trace the cables etc.

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12y ago
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Q: How do you fix the tachometer on a Mercedes 190E?
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