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My 80 works with no adapter.
I think it's a question of individual sensitivity. The MSD sends very weak pulses compared to the factory CD box. If your individual gauge is sensitive enough, it will work fine. Based on what I've seen, it's 50/50 that any given year/model will work or not without the adapter, but it seems to be 100% that it WILL work WITH the adapter.
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Mike Bradshaw
1980 911SC sunroof coupe, silver/black
Putting the sick back into sycophant!
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