Sherman
I think you'll need the electronic speedo to be compatible with the electronic pick-up on the SC tranny.
Whether you need the tach changed out will depend on what type of ignition system you'll be using to trigger the tach. On my RSR clone conversion, I used MSD and had North Hollywood Speedometer convert the tach to be compatible with the MSD. I'd call them and ask their advice on the tach.
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Tom Butler
1973 RSR Clone
1970 911E
914-6 GT Recreation in Process
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