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crazy tachometer

Electrical and Electronic

Vehicle Information: Model: 911; Year: 1984; Body Type: Coupe; Engine (type, size, modifications): 3.2 litter; Total Mileage: 85,000;

My tach has been acting up. It started with erratic readings, going up and down. Then it started to read backwards, it would idle at redline and go to 4,000 RPM when accelerting and drop back down to redline between shifts. Now it is working normally but I suspect that its reading a little low. I had the DME replaced last year after it failed. Do you think its the tach or the DME?

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