My 1994 XJS convertible has a non-operative odometer and trip gauge. The car is fitted with a trip computer and it is fully functional. Since the instrument gauges, including the speedometer are electronic is seems to me that the odometer, trip gauge and the trip computer are all sourced from the same electronic signal and therefore the odometer/trip gauge malfunction is mechanical - i.e. bad gear or shaft within the mechanism. Before tearing in to the instrument cluster, I’d appreciate comments about my assumption about a common electrical signal and the conclusion that the malfunction is mechanical. I’ve tried replacing the Speed Interface Module, but that did not solve the problem. Could it be as simple as a poor contact with the plastic printed circuit board in the instrument cluster?