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SignUp Now!On my truck (dont know if they changed anything on 2012) it should be:
Tachometer BLACK/WHITE (-) OBDII CONNECTOR
That is from a source I used when I did my alarm/remote start install.
To test you should be able to turn a meter to AC voltage and see it change when you rev the engine.
you could buy my dual interceptor setup. It reads rpm's through the obd2 port. You have the option to set a limit on the rpm's to trigger the two bright red leds on the top of the gauge. I have it set at 5000, so when the tach hits 5000 two bright red lights are flashing on my pillar.