As far as the tach goes, does your car have the tach intermediate unit? If you are using the '69 tach and your car originally had the CDI and the intermediate unit you can probably run your tach off the coil.
This is what I did when I upgraded to a 6 pin CDI on my '71. My tach runs fine from the coil, as it was originally wired, and I am still using the intermediate unit.
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Gordon
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'71 911 Coupe 3,0L
outlawed
#56 PCA Redwood Region, GGR, NASA, Speed SF
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