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In maintenance phase
Join Date: Apr 2010
Location: Jacksonville, FL
Posts: 806
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Quote:
Originally Posted by Jonny H
^ Yes, tach will work direct from the 123 without CDI. Just connect tach to coil+.
You will be down on power though. CDI makes a noticeable difference on these cars.
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Sorry for any misunderstanding! I am using a CDI no matter what. I've already purchased a Street Fire by MSD and it's sitting on the desk next to me right now. The only open question is how to drive the tach. It seems the black wire on the 123 would have the correct type of signal - although I take your point about the voltage being low.
I'll probably just have to experiment a bit. I'll try the gray wire off the MSD first, then the coil, then the black wire on the 123, and finally, if none of that works right, I'll install the MSD tach adapter.
Somehow the tach will work. 
Then the fun part! I'm looking forward to seeing how different advance curves change the personality of the engine.
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1969 911T (Getting a 72E heart transplant)
2004 Volvo XC70
Gone, but not forgotten:1971 Bug, 1978 Bus, 1982 Westy, 1996 GTi, 2000 Audi A4 2.8, 2001 Jetta Wolfsburg 1.8T, 2002 Audi allroad 2.7T, 2010 Jetta SportWagen TDi, and a couple of short lived 914s.
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