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-   -   911E Tach, 70 vs. 71 & later (http://forums.pelicanparts.com/porsche-911-technical-forum/221036-911e-tach-70-vs-71-later.html)

dafischer 05-11-2005 05:47 PM

911E Tach, 70 vs. 71 & later
 
Does anyone know what the difference is between a 70E tach (911.641.302.00) and a 71 and later (911.641.302.01)?

Are they interchangeable?

dafischer 05-12-2005 09:39 AM

Anyone?

randywebb 05-12-2005 09:49 AM

at some point in the early/mid 1970s the electronics changed, could be that point

Early_S_Man 05-12-2005 11:10 AM

Dave,

I don't have info on the specific pn's you posted, but, as Randy said ... there was a change around that time to eliminate the elusive 'Ballast unit' ... a resistive 3-terminal divider circuit that was used with the early tachs vs. the later tachs that were simply triggered by the points!

You probably can't directly interchange them with out wiring changes, but the changes are pretty simple! A later tach replacing an early one is the easiest change ... just move the Black/Violet tach trigger wire to the points input at the CDI unit!

dafischer 05-12-2005 05:36 PM

Thanks for the info, guys.

Of course, I've got the difficult case...70 NOS E tach and 72E needing tach.

randywebb 05-12-2005 09:09 PM

I posted a thread some time ago on this, but I don't hink it will help you. It related to 1973 and later I think.

I guess you could try... be sure to post results for the next person.


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