Thanks to all who have posted responses. I will reply back with results when I fix the instrument cluster. I am waiting for it to fail again...which it hasn't in a week. When it does fail again, I am going to confirm it's not any input sensor by connecting my OBD II scanner in real-time mode to the car and confirm the speedometer and tachometer readings are accurate from the PCM itself. At this point, if the speedometer and tachometer are accurate, then I will remove and inspect the instrument cluster.
Thanks, Rick