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1983 speedometer

Electrical

Vehicle Information: Model(924/944): 944; Year: 1983; Engine (type, size, modifications): 2.5L; Total Mileage: 114,000;

The wiring diagram shows two wires that connect the speedometer to the tachometer. My car does not have this connection. There are two lights and another hole in the case that is identical to the light mounting holes and one ground terminal. I assume this is a speed signal to the MPG indicator. What part do I need and where does it connect on both the speedometer and the tach.Laying loose under the speedometer is a "T" shaped plastic piece with what looks like 2 mounting holes for screws and one larger hole for some type of mounting stud. Mounted on this T is a transistor, resistor, and either a diode or smal capacitor with wires going off the T. Is this the missing piece and if so how does it mount. If not do you have any idea what it is?

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