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If the tach is bouncing without the engine changing speed while driving you have an electrical problem since the tach is driven electrically. Search along the connectors for the ignition system and see if you can find the problem. Might just be a loose connector or it could be the voltage regulator which will give a bouncing tach. Check the voltage of your charging system.
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76 911S, 2.7, Bursch Thermal Reactor Replacements, Smog Pump Removed, Magnecors, Silicone Valve Cover Gaskets, 11 Blade Fan, Carrera Oil Cooler, Turbo Tie Rods.
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