1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Flickering tach

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Old 09-23-18, 10:59 AM
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Flickering tach

My 85 GS tack is flickering but the engine rpms are steady. I would think this could be an electronic issue?
I attached a video of the tack movement. Does anyone know what’s causing this?

IMG_0370.MOV

Last edited by ACRx7-85; 09-23-18 at 11:10 AM. Reason: add video
Old 09-24-18, 11:51 AM
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Waffles - hmmm good

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Check the connection of the 2 prong connector to the alternator, another user here had an issue like this and cleaning it and plugging securely fixed it. Also make sure the trailing coil tach connection is clean and well connnected as the tach gets its pulse from the trailing on series 3 7s.
Old 09-24-18, 03:24 PM
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Originally Posted by t_g_farrell
Check the connection of the 2 prong connector to the alternator, another user here had an issue like this and cleaning it and plugging securely fixed it. Also make sure the trailing coil tach connection is clean and well connnected as the tach gets its pulse from the trailing on series 3 7s.
i will take a look this and let you know if this fixed the issue.
Thanks
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