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The tach gets it's signal from the engine speed sensor (through the DME). If you get no tach bounce, either the DME is bad or it doesn't see the signal from the engine speed sensor.
One culprit could be the connectors for the sensors. They crumbled on my early car.
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-John
'94 968 Iris Blue
'85.5 944 White - Rally Cross and wrenching practice
'84 944 Gemini Grey (gone, but missed...)
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