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1990 964 Speedometer, spoiler intermittent

Electrical and Electronic

Vehicle Information: Year: 1990; Body Type: Targa; Total Mileage: 67,600;

I purchased this car two weeks ago. It's great. Well maintained with dealer records and no oil leaks. It has two problems and I noticed the previous owner had them check this out and them found nothing. Sometimes the speedometer does not work at all, stays on zero. When it works it works right. And sometimes the spoiler light stays on and spoiler does not come up, but it will with the switch. Now, I have noticed that these seem to happen together. Is there any electrical affiliation between these two that might indicated where to start looking or are they two problem to investigate independently? I can do some car work but I'm no grease monkey. This is my first Porsche. What repair book would you recommend for general things, not pulling and rebuilding engines? Thanks, Dan

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