[cds72911]

Hi all,

Word has it that the tach on my '72 MFI 2.4 will not work with the new '79 3.0 engine. I assume this is correct so I need a new tach for my swap. I have an opportunity to trade tachometers with someone who is doing a MFI conversion.

Will a tach from a 1975 911S with CIS work with the 1979 3.0 engine?

I thought the logic was that the newer tach had to match the 6 pin CDI box. I also thought the 6 pin CDI box came out in '78.

I wonder: Why would a '75 tach (3 pin CDI box?) work any better than my '72 (3 pin CDI box)?

I am concerned that it will not work and better/differently for either of us

Thanks,
Charlie