Wiring Diagram For Aftermarket Tachometer - atsunday Jun 15, 2014On vehicle, tachometer is measuring engine speed. More about the function of tachometer can be read in the article "What Is Tachometer Function On Vehicle?" . Aftermarket tachometer wiring is oftenly confusing as it has no information from the manufacturer. No manual, no wire labels, and seller also doesn’t know how to connect wiring.Author: Heru Maruza[PDF] Conﬁrmation Warning function of Φ80mm tachometer How 1) Connect the blue(TA) wire to tachometer signal of ECU of your vehicle. ⇒Refer to "How to solder and use the solderless connectors" in Deﬁ-Link ADVANCE Control unit operation manual. 2) If you use ADVANCE ZD with the tachometer, connect the green(SP) wire to speed signal of ECU of your vehicle.