Jaguar Repair: 1987 XJS speedometer, trip odometer, service interval

Question
The speedometer on my 87 XJS 12 stopped working. Could it be a sensor or a
cable behind the dash? What do you think would be the easiest and most
efficient way to check? Also when starting the car the trip odometer will roll over
a few tenths of a mile then stop

Answer
Hi Andrew,

The speedometer, trip computer, service interval counter and the cruise control are powered by a transducer (pulse generator) on the rear of the transmission and is a common failed item. Many times it is just the wires on the transducer break.

If you have all three items not working, then that is the first place to look.

Howard