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'73 240z, pulled out the tach to fiddle with it because it only worked when it wanted to, fixing it up went marvelously because all it needed was some sanding down of the copper contacts to remove oxidation. NOW, putting it back together I've got four holes in the back of the tach for two backlights and two turn signal lights, and lo and behold I've got two backlights and two turn signal lights in the dash harness to shove back in those holes.... AND ONE MORE! Now I've gotten out my mirror-on-a-stick, shoved my head in any holes I can fit it in, searched forums, the factory service manual, and a crusty old Haynes manual and I'm not getting anywhere on this. It has it's own ground wire unlike all the bulbs that ground to the tachometer's housing and have a single power wire, and uses a different kind of lightbulb (push in, instead of bayonet type). It turns on with all the standard dash backlights when I flip on the headlights or parking lights. tach backlights and turn signals (one off-camera) on left and right, mystery light in bottom center. It has a light colored plastic hole-mount type socket, and a pair of black wires coming out of it to a connector with a black wire and a red wire with a blue stripe which go into the dash harness next to the turn signal/backlight/rheostat wires. There is a bullet splice in the black wire between the harness and the large plastic two-wire plug regular dash lights use lefthand bulb, mystery light uses righthand bulb