Hi folks. Can anyone explain how the electrical part of the speed warning indicator works on a 1968 Camaro? I've gotten an aftermarket speedometer with the needle and cable, and the wiring harness. But I can't find a buzzer except on Ebay, and all of those have 3 terminals on them. The speedometer itself has black and brown wires, the harness has a pink and a white wire. Is the black speedometer wire a ground? It looks to me as if the black wire grounds to the cluster and the harness wires are both hot. Is the needle the switch that connects the 2 hot wires so that the buzzer goes off? That would explain the 3rd terminal on the buzzer, where the wire from the speedometer would plug in. If not, what makes it trigger when the speedometer indicator needle eclipses the speed warning needle? Also, when the speedometer needle gets to the preset speed, is it supposed to stop where the warning needle is set? Anything to help me understand this system would be greatly appreciated. Thanks!