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911 1972 Tachometer Problem

Electrical

Vehicle Information: Model: 911T; Year: 1972; Body Type: Targa; Engine (type, size, modifications): 2.4L; Total Mileage: 80,000;

I recently purchased my 1972 911T. The tachometer works fine until I turn on my headlights. Then the tachometer needle falls to much lower values. The error is even greater when I switch to bright lights. Should I send the tach off for repairs or is there likely to be problem with the electrical connections?

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