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Does anyone know what the trim version the turbo is in the stock 280zxt.
I believe the turo that came stock from Nissan is a Garret T3 model, but I am unsure of the A/R size - 40, 45, 50, or 60?
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Try checking the battery connections. I had the same thing happen and found the tach stopped bouncing once I cleaned the terminals (and negative cable on the opposite end of the battry terminal) and...

The gap is the distance between the cam lobe (big end not the "Pointy" end) and the rocker arm pad. Its the point when the valve is fully closed.
The cam needs a small clearance to rotate around...