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As far as the RPM is concerned, the Failsafe gauge is looking for a square wave input. It calculates the RPM based on the programmed pulses per revolution in the AEM Failsafe Configuration software. Unfortunately there is no digital tach signal wire going to the combination meter (aka instrument cluster aka gauge cluster). The current RPM value is shared via CANBUS between the combination meter and the engine control module. The only wire with the necessary square wave signal is going directly from the Crankshaft Position Sensor to the ECM.
I do not know enough about the stock CPS to be able to tell you if this will work or not for the Failsafe Gauge. It depends on two things:
1) Find out what the resolution is on the stock crankshaft sensor wheel. This will depend on what type of sensor it is. It's more than likely a hall effect sensor. I would imagine that it has a pretty high resolution, something along the lines of 50-80 pulses per revolution.
2) Download the Failsafe Configuration software from AEM and plug in your failsafe gauge. Check the RPM Pulses per Revolution option and make sure you can select the same Pulses/Rev as the stock sensor.
If all of this checks out, I can figure out where and which wire you should splice into.
I do have to warn, in general as an EE, I would recommend against messing with any of the stock Crankshaft Position Sensor wiring. If you mess up that sensor, the wire, or the ECM, it's going to be pricey and labor intensive to fix it.
-Acree
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