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914World.com _ 914World Garage _ Tach needle that jumps...sometimes...?
Posted by: 1972914 Aug 31 2010, 03:00 PM
Ok, so I am new to 914 ownership, but not to Porsche ownership. I seem to have discovered an interesting issue. The tach needle sometimes just starts "bouncing". Does not seem to be related to any other maneuvers - braking, lights, etc...
Any thoughts?
Posted by: Sleepin Aug 31 2010, 03:05 PM
Loose or dirty connection on the coil. Or loose or dity connection on the back of the gauge.
Oh, and 
Posted by: dr914@autoatlanta.com Aug 31 2010, 03:16 PM
Dirty points or bad tach ballest. Replace the points and condenser, reset the dwell and the timing. If the needle still bounces, replace the tach with a nice rebuilt one
Ok, so I am new to 914 ownership, but not to Porsche ownership. I seem to have discovered an interesting issue. The tach needle sometimes just starts "bouncing". Does not seem to be related to any other maneuvers - braking, lights, etc...
Any thoughts?
Posted by: SirAndy Aug 31 2010, 04:02 PM
Also check the bottom of the relay board for cracks. The pass-through rivets can brake lose from the solder and create all kinds of intermittent electrical issues, including a bouncing tach ...
Andy
Posted by: 1972914 Aug 31 2010, 04:41 PM
Thanks guys
I'll check it out.
Rob
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