Engine Control Module Signals
The "Ti" & "TD" signals are produced by the engine control module (DME) and sent to the cluster. On models produced before 9/98, the "Ti" and "TD" signals were sent to the cluster via a dedicated signal line.
From 9/98, these signals are sent to the cluster via the CAN-Bus.
The cluster processes the signals for the tachometer and fuel economy indicator displays. The Ti signal is used by the cluster for the SI indicator. The cluster also passes the TD signal out over the K Bus.