Lee,
Your rev limiter is one of the infamous 'speed relays' that operates the fuel pump relay, which interrupts power to the fuel pump. The same signal that drives the tachometer is fed to the speed relay, which is labeled 'J-35 Speed Switch' in your part II of the '78 circuit diagram in th factory service manual.
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Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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