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Why does this 76 Tach not work on my 74 911?
I mean, is it broken or did I just spend a lot of money for the wrong unit. The connections on the back side look the same:
1974  1976  Maybe I should mention that I run my 1974 Porsche 911 with a MSD 6AL ignition w/o any issues with the stock tach. Thanks for your comments! Markus Last edited by munich; 03-27-2010 at 07:43 AM.. |
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03-27-2010, 07:40 AM
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Registered
Join Date: Oct 2005
Location: Capistrano Beach, Ca.
Posts: 7,235
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I think your mention of the MSD may be the clue. I believe on some applications, you need an additional electronic component to run the MSD with the tach on certain year cars--not sure what it is but I have read about it on the forum. Possibly, the electronics of the 76 tach fall into that category. Just a guess, but someone who is familiar with MSD will post soon to help you out, I'm sure.
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L.J. Recovering Porsche-holic Gave up trying to stay clean Stabilized on a Pelican I.V. drip |
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03-27-2010, 07:59 AM
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Make My Day
Join Date: May 2003
Location: Northern NY
Posts: 1,305
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+1 I think the tach is hooked up differently w/ MSD, not exactly sure though.
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74 911S Targa ROW Building Designer/Business Owner |
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03-27-2010, 08:19 AM
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Thanks for the input! I found this on the msd website but it confuses me even more...
Does anybody know if there is a major difference in triggering the tach between 74 and 76? |
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03-27-2010, 10:48 AM
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