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The tachometer needle on my 83 SC floats sometimes, and the druck pressure gauge has a bit of a tremor under idle. Is this a gauge issue or an electrical issue?

  • 1983
  • 911 SC
Silver Spring, 

The tach needle periodically "floats up" above what should be the true reading at startup and under normal driving conditions.  Appears to read correctly under acceleration and idle most times.  The druck pressure gauge also has a tremor (ticks between 4-5) at idle when the car is at operating temp, but appears to read correctly under load.  Trying to determine whether these are gauge issues or sensor issues (or whether that's one and the same).  Speedo, temp, oil level and fuel appear to be functioning properly.  Any insight would be greatly appreciated.

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