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1985 911 Carrera Instruments fluctuating

Electrical and Electronic

Vehicle Information: Model: 911; Year: 1985; Body Type: Coupe; Engine (type, size, modifications): 3.2; Total Mileage: 193,000;

I am having a recurring problem with my instruments (oil, pressure & temp and tach) fluctuating. I had the engine out a few months ago while doing a clutch change. I cleaned the ground strap and the problem went away. Now it seems to be back only now the tach is also joining in. The gauges are generally accurate, but the needles are always bouncing. Do I have another bad ground somewhere?

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