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I am pretty sure the center lead is the base. Emitter-Base-Collector with the flat part of the semicircle or the heat sink upwards. I believe Emitter is the negative lead side.
If the center lead is not used, it is functioning as a diode. The MFI RPM transducer does this. A Zener diode can be substituted.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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