Looking for the RPM signal Wire to tap cruise control into

bump, there has to be someone out there who has installed an aftermarket tach.... I basically need to tap in that wire so the cruise control I bought for the car will work. Does anyone know where the wire is... what color?
 
thanks for the link but in it I dont see the RPM signal wire...

Does anyone have a pinout of all the wires going to the ECU and what they do? Maybe someone can post another link?

Thanks you very much, in advance for whoever does this.
 
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