have 87 elcamino,removed every wire and device that GM thought was so important,,,,I have got every thing to work (with out ecm and 40 wires ) except the temp gauge....It did work before I started removing process,,,What wire color????? Receives the signal from the sender??? I have tried a new sender,,,it sends ohms signal,,,ok,,,I have tried the sensor by the #1 spark plug,,,it also sends an ohms reading,,,,so,,I am ready to receive the ohms signal at the gauge with no luck.....can't communicate with the gauge....any I deals,,,,norm