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dweymer's Avatar
 
Join Date: Nov 2004
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DIY tach repair

I have searched, and found various threads on tach dampening, but none on how to actually repair the dampening. Can anyone post a detailed description on how to do it.
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Donnie

'74 911
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Old 08-15-2007, 05:10 AM
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did you search

tach Early_S_Man





he's the best
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Ronin LB
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Old 08-15-2007, 06:14 AM
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yes, Warren is the man; but most responses deal with voltage issues or points. My tach does not jump around, it just overshoots then stabilizes, thus dampening.
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Donnie

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Old 08-15-2007, 06:52 AM
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ok..

all i know is that there is a spring in there somewhere that weakens with age. My tach stabilizes at 100rpm less. I imagine it could cause other problems?
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Ronin LB
'77 911s 2.7
PMO E 8.5
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w x6
Old 08-15-2007, 09:17 PM
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Donnie,

Buy a NEW VDO tach, they are about $80. You will find the movement nearly identical and the electronics an updated version of the old one-shot. Swap the insides and you're off.

There is a great deal of inertia in the old VDO movement, mostly because it's all metal. Ron's right, there's a hairspring that causes the needle to return to zero, and like all springs, it fatigues with age.
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Last edited by 304065; 08-16-2007 at 06:07 AM..
Old 08-16-2007, 05:53 AM
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I am on my second used tach, so that is getting to be a possibility. Palo Alto quoted $115 to rebuild mine so I may do that too. Just wanted to know what exactly they were doing, 'cause the insides are all magic smoke to me
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Old 08-16-2007, 06:37 AM
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