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I need a tach cable for a 1968 Mooney M20G. Google Bard says I need a 38"


Jrags

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Google Bard says I need a 38" cable with "right lay"  I can understand the 38" but I can't understand how a tach cable has preferred twist direction.  Doesn't the spline inside just float freely and will turn which ever way the engine connection turns?  So they how is there even such a thing as "lay?"

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1 hour ago, Jrags said:

Google Bard says I need a 38" cable with "right lay"  I can understand the 38" but I can't understand how a tach cable has preferred twist direction.  Doesn't the spline inside just float freely and will turn which ever way the engine connection turns?  So they how is there even such a thing as "lay?"

The lay is important because you want the cable to tighten with rotation rather than unwind.

Are you sure that you need a new cable? Often the problem is that they're running dry and need some speedometer cable lube applied.

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