If the instruments were working correctly before you removed the orange tachometer, I would suspect that you have loosened a connection or shorted on. To correct the problem you would have to find the loose connection or short. If your old gages worked correctly and the problem occurred after you put the new ones in I would suggest that the sending units are not comparable with the new gauges unless the sending units were also replaced. Knowing the make of gauges and the vehicle you are working on will be needed if you have additional questions.
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