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On the early 944 and probably the rest from what I've read.
The needle on the Tach will bounce slightly on start up before the engine catches during normal operation, someplace between 0 and the first line on the tach on mine.
Basically its the dme reporting that its receiving a signal from the reference sensor.
If you want a better explaination of my problem pull the fuel pump fuse and crank the engine. It should run off the residual fuel in the line for a second and die. Then try starting it again while you watch the tach.
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