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tachometer fluctuation

Electrical

Vehicle Information: Year: 88; Engine (Size, Modifications): 930 3.3; Total Mileage: 32000;

The tach very frequently bounces around while running. I noticed that when I put a load on the system (i.e.: turned on the fan or headlights etc) the tach either returns to normal or goes to 100 rpm. I've been told that its frequently a voltage regulator problem. Thought it might be the sender. I have heard its a common problem. Possible solution? ThanksDavid Noznesky

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