System Operation: Tachometer
WARNING: This page is about a different car, the 2019 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
The tachometer is an analog gauge on the base and optional mid-level IPC. The temperature gauge is a virtual gauge on the optional high-level IPC.
The IPC receives the engine rpm data message from the GWM over the HS-CAN3. The GWM receives the engine rpm data message from the PCM over the HS-CAN1.